Malicious PDF — malware analysis report

Static analysis result for SHA-256 5556dc9a3608276b…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 08:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 263ef975e46612021ce9a7d5c7abbfd7 SHA-1: 969eafe346c385fc42bfddb58e09376245b53c71 SHA-256: 5556dc9a3608276b2f0044f09889dce29e12cffabf3223f0bad960458c646934
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=medical+dictionary+english+arabic+free++pdf PDF link annotation
    • http://sugujivenaro.iblogger.org/upsc_mains_answer_sheet_of_toppers.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/hbnjegj/dynamons_world_mod_apk_unlimited_pokemon_download.pdfIn PDF document text
    • https://simebofes.weebly.com/uploads/1/3/1/4/131438459/ce3c938f2e.pdfIn PDF document text
    • http://zedukibawubige.22web.org/mewomovetifeki.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/wimijog_nozodatofix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466173/normal_5fe2404ff2fcc.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/iiwDadY/7665091664.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/hiFCjd9/gipugafatofozi.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/j14gfje/68445204175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_6042d1d084746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_601f295a9d4d1.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/bgjgiq2/cowboy_caviar_with_italian_dressing_packet.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/vazaparire.pdfIn PDF document text
    • https://sobopagep.weebly.com/uploads/1/3/0/8/130873740/kotuju.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/siwozigoned.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_6012baf9579f6.pdfIn PDF document text
    • http://xatubaxo.iblogger.org/saeco_coffee_machine_buy.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/a1603.pdfIn PDF document text
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/vujiji_jonadadogu_bigizisijib_wukekipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://birukuf.onlinewebshop.net/mibejuni.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/alcoholismo_y_familia.pdfIn PDF document text
    • http://kelegelevun.epizy.com/xodigejawufavagu.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/xotogotasukol.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_bfcbce67002946668e314f59a353fb1c.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_0d49d6cd60034fccb068535c4178b77c.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_64826d341d5f426ab352b5fb3dc3a3d5.pdf?index=trueIn PDF document text
    • https://471876dd-1950-42f1-a4b7-18bccbaeda70.filesusr.com/ugd/5d8976_87b3c5b99c0a4e03966e1039b29d68bc.pdf?index=trueIn PDF document text
    • http://jowokepo.atwebpages.com/51532418319.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_e899b43899224781a2399e818b602da5.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011050.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11050 19468 bytes
SHA-256: 7c7de2cfacbddbadb1f44a58fadd3885869274770e8998edf3f68ba9429ee2d3
font_00_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 5664 bytes
SHA-256: 0e219ed582353a18948e54b171a2f4c75c6e9f7d52a652f56bfb43c7b87fb299
font_01_sfnt_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 11072 bytes
SHA-256: 9e60d6aa5e0e80020d60dcdf9d6fa843325d6b1f19164a1e66a6b41d4c184296

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