Malicious PDF — malware analysis report

Static analysis result for SHA-256 a887bff3129c2754…

MALICIOUS

PDF

81.8 KB Created: 2021-03-04 02:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2f2885030d2b85f2c8fa51f707b57f3 SHA-1: c273315fdb09f2c184f33e3fa0e44e885ce075bc SHA-256: a887bff3129c2754b6dd4db7df90ba061249144047fdff31bee845bab2d75f35
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/award?keyword=rules+for+writers+8th+edition+online PDF link annotation
    • https://cdn.sqhk.co/gitopedevid/jfzonhc/70728005797.pdfIn PDF document text
    • http://dnepr24.info/guide_stick_win_war_legacy_parentsmtnpg.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/gjjjieM/antique_tractor_pulls_in_ohio.pdfIn PDF document text
    • http://techanomic.com/crane_cool_mist_humidifier_stopped_working2s0a9.pdfIn PDF document text
    • http://energytik.net/jijum0ic30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5ff318cb2176c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_6019690d4eb34.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/qYghgdB/zugotu.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/oijbjet/halloween_costume_ideas_2020_college.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368976/normal_5fcc0894ee649.pdfIn PDF document text
    • http://mirolibilo.iblogger.org/jafexolizufiwifibukiveguv.pdfIn PDF document text
    • http://cabinetsapp.xyz/destiny_2_walkthrough_guidezmpiv.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/eIigcV3/71411501081.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/f4HjiLl/adventure_escape_murder_inn_chapter_4.pdfIn PDF document text
    • http://segorewadidet.iblogger.org/how_to_draw_pictures_for_a_childrens_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mixanaz/99077293695.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/vajigupiwex.pdfIn PDF document text
    • http://zedafazoteto.epizy.com/87470474287.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/kixawavukejekeda.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/awesome_resume_templates.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 5080 bytes
SHA-256: a0dcfa1fa708c1c0d93d1139a44854ff1c1e8bc18344ee95bf6f4eb210e89cef
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 15416 bytes
SHA-256: 4b5f374c188cc64bda5dd33418bfe44336c9954d513a78beb14633b42759701a

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