Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a045e4debadcf3…

MALICIOUS

PDF

76.7 KB Created: 2021-03-19 16:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d04d31e2a50baf6e8887e7f865a593 SHA-1: 6cc202ec9025fb5d8eba526aeb934041c25ed737 SHA-256: c1a045e4debadcf32ca89cb624fc41fce4e3dbdca84a97188b2c7da98ab9e742
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 disguised as legitimate content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/123?utm_term=apple+video+converter+free
    • https://cdn.sqhk.co/zebimapajod/Xgjjcek/defense_battle_mod_apk_hokage242.pdf
    • https://static.s123-cdn-static.com/uploads/4487201/normal_6005c54c16457.pdf
    • https://cdn.sqhk.co/kagaxavog/gpRibhe/legofesoro.pdf
    • http://fawaxifiwuzodil.scienceontheweb.net/how_to_get_white_teeth_with_apple_cider_vinegar.pdf
    • https://cdn.sqhk.co/fejukomus/NgiqAl7/kamabimanajepekukulosa.pdf
    • https://cdn.sqhk.co/veletafi/fwibAjf/crossy_road_castle_multiplayer_not_working.pdf
    • http://gobuweba.22web.org/pembelajaran_behaviorisme.pdf
    • https://cdn.sqhk.co/daxegajok/VSKhh67/microsoft_teams_background_effects_mac.pdf
    • https://cdn.sqhk.co/pofadugilip/fNVXljg/nulonugovonava.pdf
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5fec536386d6a.pdf
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5feb94f08f348.pdf
    • https://cdn.sqhk.co/juwafajem/jieif0N/bank_account_balance_in_spanish.pdf
    • https://cdn-cms.f-static.net/uploads/4379034/normal_601df38f269f2.pdf
    • http://lepasipun.iblogger.org/prasanth_tamil_album_song_masstamilan.pdf
    • https://cdn.sqhk.co/nozujeraguje/idLYhhG/60441064634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_1e4575baecb945128c5259cbdfcd2948.pdf?index=true
    • http://wugujub.onlinewebshop.net/20852882450.pdf
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_574df0739059472993a06cec56395f98.pdf?index=true
    • http://medojowibapij.epizy.com/93765743668.pdf
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_4f3b71d5ea6c4cf79c14df74507cad68.pdf?index=true
    • http://pulitisagot.atwebpages.com/3964670530.pdf
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_6228e0ef035743af95bf6595f35d833b.pdf?index=true
    • http://vesofimuni.rf.gd/46754294278.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_off0000eda4.bin
dd26925f8eb1a7dc6c2d9d08b370860a1699d5cd4cc0b58c78fd8f8e7f8230ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 4808 bytes
font_01_sfnt_off0000fe1e.bin
19cd3a38b08e2c09f2924b5184e7f41a44c18afa9ebae2739f5e32823805e536		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 11144 bytes

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