Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec93731dc04963a…

MALICIOUS

PDF

103.7 KB Created: 2021-03-22 15:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdedfa3153929abbdd56ccad560525fd SHA-1: 5a24299cf9aef3e7638365ef64af74e5033c7f10 SHA-256: aec93731dc04963a797bba528a37eecaa5b0f0605ca5691ff7acacf2e32a1c95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dugedepap.ru/award?keyword=circularly+and+elliptically+polarized+light+pdf PDF link annotation
    • http://hisgohar.site/21674634347zhet8.pdfIn PDF document text
    • http://japadalifu.22web.org/libufoxedibop.pdfIn PDF document text
    • https://cdn.sqhk.co/panazomuv/rgijdRS/bigukisaliponirajok.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/mdopdhc/county_police_officer_salary_ohio.pdfIn PDF document text
    • http://didazema.mypressonline.com/what_is_a_landscape_social_studies_work.pdfIn PDF document text
    • http://sell-toclick.online/hoover_windtunnel_max_capacity_petbjak4.pdfIn PDF document text
    • http://dwatches.site/how_to_super_jump_in_breath_of_the_wildyntme.pdfIn PDF document text
    • http://titanovyi-filtr.ru/1453937260126v2r.pdfIn PDF document text
    • http://dk-inc.xyz/44870609694q2wga.pdfIn PDF document text
    • http://openchambre.xyz/creative_sound_blaster_z_pcie_gaming_sound_cardxsce8.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/egelUhd/retract_battle_royale_apk_uptodown.pdfIn PDF document text
    • http://online-sistem.site/rupuxenezizi6qfm6.pdfIn PDF document text
    • http://vvd.bar/how_to_soft_reset_galaxy_j7_stargcvyx.pdfIn PDF document text
    • http://shoes-storie.club/48085383093jdclq.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/chbIra2/93254569614.pdfIn PDF document text
    • http://lagujegivupani.22web.org/xunivoloboluwod.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/hr54-200_vs_hr54-500.pdfIn PDF document text
    • http://getcreditcheck.info/nepirelonapodunizomubynhu.pdfIn PDF document text
    • http://satomupudogoni.22web.org/brandy_melville_california_hoodie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_4b56c2fc408f4d1186706bccf8ac483b.pdf?index=trueIn PDF document text
    • http://pegewolonu.rf.gd/30602897024.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_8591ece124bf4f91947528cc70207790.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_8d25af4ed3304dbfbf2faf15c1deb72f.pdf?index=trueIn PDF document text
    • http://lonukidoni.epizy.com/capitalismo_tardio_e_sociabilidade_moderna.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_79f3bdfa7852470aa9cfa1e1103b1ca1.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_43dfcb87b4c44635906cb9d8690174df.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 5296 bytes
SHA-256: 3d943174b72099c3ee9309dbbb2ff9ff88232728d4d3166f18b14c3a7dce47bc
font_01_sfnt_off00014d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D72 13716 bytes
SHA-256: 675e0b74eea969fda25cc82b776c51b99dd929700ceaf3b73453e387c6e4f9ba
font_02_sfnt_off00017a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A33 16240 bytes
SHA-256: d1f2d4f3ccb753bdc263bfd4509c36b7d9e8219f3aa1e529a3f20fda2a704f73