Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4b630970b30728…

MALICIOUS

PDF

77.5 KB Created: 2021-03-19 00:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0191d670b73f94da4b7995cab300abd9 SHA-1: 2572d119be48ca64dfc82bd06d46a824b903b299 SHA-256: 0c4b630970b3072807c7fa247c95e509eab59aa41ed5a5bab9eb2be8da68a1e2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites, likely as part of a broader phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=all+about+me+worksheet+pdf+free PDF link annotation
    • https://cdn.sqhk.co/guwiwugomo/Jji8gir/patamakigeganalizugelode.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/haH57RD/liserinew.pdfIn PDF document text
    • https://cdn.sqhk.co/bobofibu/giic4o7/46620417112.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/7nxijbs/35_ty_draw_road_cardiff.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/digDvij/41005158350.pdfIn PDF document text
    • http://daniele.store/lysistrata_playq3doe.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/hgJDThh/24544096046.pdfIn PDF document text
    • http://pokypka.xyz/batawenuvolid5mdne.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/ge8jiih/mavedimopedamasew.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/jgmgjja/amc_the_walking_dead_season_9.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/ifOjfoV/lazomigojo.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/adJPyuE/pinball_wizard_game_apple_arcade.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/cllUHKF/vegubitavevejurojama.pdfIn PDF document text
    • http://bestrongbyg.com/32382355112jd34l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_e44742be414540af916320764281eaf8.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_fb9142f6e1b54f35b574853b0096a96e.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_9227605a5abc4d4e832f66d973c45484.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_357b5fdc3f3741b183001ed681e35c0d.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_79bb2d6b9c46407f869653ff9001a2d9.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_ccf2dbe7214347e7af7932932d8e1203.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5568 bytes
SHA-256: 15d6cdda2b2ee31ed6680e4fb8a0224db53804747cb8b61d090e5975a0581666
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 10588 bytes
SHA-256: 0859e9770d2f82f5fdc5bce0ed22e18198b3a05af64f5cfe5595dc3ff052668c

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