Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ff35aeb578eb7a…

MALICIOUS

PDF

93.7 KB Created: 2021-03-30 10:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e06fb5844942751f8f525b59fa376442 SHA-1: 7d850c95afc839d7c6d6c08e1984ba361fadacb1 SHA-256: 68ff35aeb578eb7a5e883442d017d3c14c817176311facf6a2702f153a3b137d
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with the primary URL suggesting a lure related to 'python coding book pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and extensive external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/award?keyword=python+coding+book+pdf
    • https://cdn.sqhk.co/rufadexu/eTjhfd2/34680760193.pdf
    • https://zejofisedefumot.weebly.com/uploads/1/3/4/6/134667534/pulotoso_puvepizegij_jemimotug.pdf
    • https://perikoweb.weebly.com/uploads/1/3/5/2/135297066/9256285.pdf
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/wemeg.pdf
    • https://cdn.sqhk.co/xuxodokoju/baicibZ/368531606.pdf
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/delodomuga.pdf
    • https://cdn.sqhk.co/pevelefotuve/cghigHz/download_video_wallpaper_setup._exe.pdf
    • http://ellmax-site.xyz/4775260274277qly.pdf
    • http://academic-club.ru/air_force_1_shadow_pale_ivory_pastelystrp.pdf
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/sixopogekol.pdf
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/ruwowetanal.pdf
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/fetamokif.pdf
    • http://triple-doska6.club/12_class_psychology_bookegbcb.pdf
    • http://2220202.ru/how_long_does_it_take_to_learn_tattooingk03h5.pdf
    • http://copyrighthelpcentral.com/6374308573847blk.pdf
    • http://reggis.info/pixidodufadavinora6pulx.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/023d778e.pdf
    • https://cdn.sqhk.co/kegufamop/bgdjhgg/tactical_fleece_jacket_navy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_ccdfeacdc27043298ab349e45f8f0545.pdf?index=true
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_d922b2504a6d4c72aad2b8bc401159e3.pdf?index=true
    • https://602af194-5307-4bd7-bf09-435e6df32b58.filesusr.com/ugd/bf07b1_a1c3d5d5944e4febaa4e82c448fbf7e9.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012483.bin
2cdf1c481d54975d51e8992e56d7b28337eed5ccab1c2b2c1a464848214fc3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 4880 bytes
font_01_sfnt_off00013519.bin
abfa2bdc0a9c68545c994d67dadeb530077a2ce684b051db7ffe0875d9b3ccc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 11216 bytes
font_02_sfnt_off00015b48.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B48 4324 bytes

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