Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a26268d28cd366…

MALICIOUS

PDF

81.0 KB Created: 2021-04-25 14:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f9c5588f6fb3274bcb2cc514960bcd79 SHA-1: 1adedd25dfaf3ed73e96f0d45eca73eb9894d25b SHA-256: 71a26268d28cd3661f285103de6eab85ec973cd4005284eac5befe3e5420f7e4
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports this, implying a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=merit+badge+college+2021+pa PDF link annotation
    • https://cdn.sqhk.co/manizamo/lia0oii/mythware_classroom_management_software_free.pdfIn PDF document text
    • https://kuxapularutamux.weebly.com/uploads/1/3/5/9/135984678/6520209.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/hfgc8hi/did_you_know_facts_about_health_and_fitness.pdfIn PDF document text
    • http://aycotoro0.xyz/valinoqzog6.pdfIn PDF document text
    • https://kaxuzuditad.weebly.com/uploads/1/3/5/3/135310968/wojujibivafejevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_60256933e1b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_60469d6340bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501042/normal_603bff91cfa28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_606e807f2dd40.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/gcLuifY/jobatopawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd3af01365d4.pdfIn PDF document text
    • http://bogplaktnc.fun/64653672795pb99.pdfIn PDF document text
    • http://prizinsta365.website/maths_worksheets_for_year_5_australiapkyxh.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/2286685.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/xajemu-dokarup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://serozefa.epizy.com/4783762232.pdfIn PDF document text
    • http://xusijaxux.rf.gd/corporate_brochure_design.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/boondocks_season_4_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/are_smartwatches_worth_buying.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/80496817834.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 5216 bytes
SHA-256: a744e4e646a9c74fdaf0681ee80e91ef9c2322a1b2d356d7f957c6d6bdcaec75
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 11804 bytes
SHA-256: 835abc83432c0e6a3701209a44414e3c65c882aff6ee93eee57a3e69b5ffb3b6
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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