Malicious PDF — malware analysis report

Static analysis result for SHA-256 a447367f5e782ab0…

MALICIOUS

PDF

103.0 KB Created: 2021-04-29 17:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 04e32c318738d45ab5b01553dc5ebad7 SHA-1: 28896f8544e70317c076842560a80e42fb0298fe SHA-256: a447367f5e782ab0ff49f0ed42eb516372642aac5bcb599f694b287d78327a94
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on disposable or suspicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate that the primary purpose is to redirect users to potentially malicious content or to manipulate search engine results. While no scripts were directly extracted, the nature of the embedded links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=what+are+the+3+types+of+tolerances+that+appear+on+dimensioned+drawings In PDF document text
    • https://cdn.sqhk.co/nowavutu/igeiagj/xogidadase.pdfIn PDF document text
    • http://profaudit32.ru/sky_wing_5.0tj7ib.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/gciifDY/dragon_ball_z_battle_of_gods_goku_transformation.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/6dd901c776a2c.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/6jTiib8/free_download_mx_video_player_for_pc.pdfIn PDF document text
    • http://d2-club.ru/jukozovezusofumiwrp0j5.pdfIn PDF document text
    • http://ayazshabutdinov.club/long_division_worksheets_7th_grade08koy.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/HvsiiXl/color_by_number_app_free.pdfIn PDF document text
    • http://cardioactiveitalia.site/rufepiliwukofepexe94f.pdfIn PDF document text
    • https://webojugobe.weebly.com/uploads/1/3/4/6/134601542/gifuwarodubefad_ripelasaxo_zamakawumexome_zegobuza.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/tivowaputa-pezonito-wedun-tizoluw.pdfIn PDF document text
    • https://zomutelisofo.weebly.com/uploads/1/3/4/7/134712892/270d9f358a0.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/kewakatin-sebatalud-zatibar-jejaxutofeg.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/ljfWajc/nipoj.pdfIn PDF document text
    • http://onenature.space/konutuvaxozupanizak6lxa.pdfIn PDF document text
    • http://magazok.top/krk_rokit_5_g1_pricelg94t.pdfIn PDF document text
    • http://update-win20.online/71202388019nqwzc.pdfIn PDF document text
    • http://7lessons.site/fc_bayern_munich_ii_sofascore4x2q3.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/642e188e51bea.pdfIn PDF document text
    • http://amandeepsadyora.com/vezijonupuxefqg0ng.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_7f4cb93113a748429ca49814113d506b.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_fd472184a5d6499d9a6440ed41f03228.pdf?index=trueIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_9fb56782dd71495bbe7c562662e92c84.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_e37e0ccbb6fd45409f5560f009cfdf05.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 5940 bytes
SHA-256: 3ed8644cb718a38fe9e7f237b0209bc63c9ffd2f3c1fb44d703ca08f2738eca4
font_02_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 10712 bytes
SHA-256: 1ad4ba34a22b4078276d44a61d8224b5c7fac07a4d3fce9ec6d7802e6bc9dd6c
font_03_sfnt_off0001496d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 10892 bytes
SHA-256: dad3f8bb79d0fba00bc3e5d8cc4cb99a59a44ee165a3a0fc5b4580130b3dfcc6
font_04_sfnt_off00016ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE2 16408 bytes
SHA-256: ce8a20b7519cd566ecb17afb8d04134d1713f37dc3e4fde0caa675fc70d58935
font_05_sfnt_off000184e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184E7 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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