Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6914d3c774d546…

MALICIOUS

PDF

95.4 KB Created: 2021-03-31 23:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cfc83fcf56ac3439dacb2630dea628b6 SHA-1: ef5f52e804cfa53cd459cb9d0d4e06d041c032c6 SHA-256: ff6914d3c774d546dbea6e64df3304f68dae9998288f2cad6521f4c23b398b68
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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://pelibifir.ru/wix?keyword=better+homes+and+gardens+crossmill+end+table PDF link annotation
    • https://cdn.sqhk.co/gaxomawelej/hjchegc/snapchat_logo_white_transparent.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/hgjgwvE/sibogulokar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fcccd6015aed.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/3ohh1pE/how_to_make_minigames_in_minecraft_pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_6033dfc04a288.pdfIn PDF document text
    • http://community-day.ru/8884456889udgd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_603c4b92b12b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476288/normal_60066b7aa225a.pdfIn PDF document text
    • http://magazok.top/muvijiniwc6iq.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/eKlhbhe/word_borders_and_shading_shortcut.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/7jblggJ/brazil_song_video.pdfIn PDF document text
    • http://masalev.ru/excel_vba_learning_free_ebookskkxmc.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/mZGqhg8/videoder_free_for_pc_windows_10.pdfIn PDF document text
    • http://pipvip.ru/wifi_file_transfer_apk_for_pced55g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fd8c85e4c520.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/hhdR4qr/teach_your_child_mental_math.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/WhdhjoA/lineage_2_revolution_classes_tier_list.pdfIn PDF document text
    • http://trynon.xyz/36048089748n38b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_f9279aa962cd43258d90e23ccd02bef2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/pijala.pdfIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_0504d89ed284469ea504139fbb95bb63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/last_reported_case_of_zika_in_aruba.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_c682b64055404ec393e0c152f653cc62.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_62304106c5c94a07b6a1933b08f13a68.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 5332 bytes
SHA-256: 5be507a6d983799304603893e52305471e6661899ffa01bb85f06efdaac7d743
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 11504 bytes
SHA-256: 5617e64bf38197a77403c564ec4f764526d746f35baea550c8b1021bb7a4b67f
font_03_sfnt_off000149e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E2 16180 bytes
SHA-256: 63e228c5bcaef407fe081716b21821506d014dd186415b012e2dfdcb716b4a6e
font_04_sfnt_off00015ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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