Malicious PDF — malware analysis report

Static analysis result for SHA-256 9deffe521d64d5cc…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 11:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384e8f4df14d3ddab30a8cb167dfbaa9 SHA-1: 70812543a66e1ff968ea57981cf3ab2ce03fbdab SHA-256: 9deffe521d64d5cc70503a7813f5a2e8fd81bbc0723926229322dc9ee086cdec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured as SEO-optimized URLs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs and the PDF's structure point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=carnival+row+soundtrack++zip
    • http://erkutungotu.com/39514926783zs71e.pdf
    • https://cdn.sqhk.co/lexebogefaj/haZifie/foosball_table_rental_near_me.pdf
    • https://cdn.sqhk.co/katutilit/sj5vhdM/64108335524.pdf
    • https://cdn.sqhk.co/feketukadoz/hidY92I/bomber_jacket_outfits_guys.pdf
    • https://cdn.sqhk.co/zumovinej/CbijTgj/24819300545.pdf
    • http://lnstagram-helps-contact.com/the_40_rules_of_love_in_urdukzeln.pdf
    • https://cdn.sqhk.co/jedepazisu/hfKihhb/best_outdoor_basketball_hoops_in_ground.pdf
    • https://cdn.sqhk.co/fovuxugo/7jdihnW/latest_flower_nail_art_designs_gallery_2019.pdf
    • http://rasujipegov.iblogger.org/solve_the_quadratic_inequality._write_the_solution_set_in_interval_notation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rezimezamuz.rf.gd/social_media_marketing_strategy_example.pdf
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_e8a6bfc5ea434bc1be70d2a01b2b5cb5.pdf?index=true
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_32bb6502fcad4271aa01b7e38cb22dd7.pdf?index=true
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_23e17723528c49e1ad7a3fc5a8072b75.pdf?index=true
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_ed1266d2b26b48ba853147f5be166766.pdf?index=true
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_219e5d14af7a42818d2176423f27bcd1.pdf?index=true
    • https://s3.amazonaws.com/lowebemuwojiso/8173624538.pdf
    • https://s3.amazonaws.com/posufij/desiwejabikivirupezuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8f.bin
5ac23a33573080e250017e10f6f698b15c1f405fd989dcc44eec4efa17e1b5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5240 bytes
font_01_sfnt_off0000ff8b.bin
d33be6072c28ff281c2fde49d6d2561468da377d5895fda87cd6faf77d6a5f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 11200 bytes

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