Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac70c3ff1245c9ba…

MALICIOUS

PDF

80.1 KB Created: 2021-02-15 01:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 33ce346c340a04609d4a4ee04d9655b3 SHA-1: b92463ca4d011f2b886ded61dfb135c2a34fe81e SHA-256: ac70c3ff1245c9ba027c660a8daf43a4668d4fa075732590ca1ebef6b0d5e12f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://seumenha.ru/123?utm_term=fort+mohave+annual+weather PDF link annotation
    • https://cdn.sqhk.co/puburikob/MVr6Via/68371354735.pdfIn PDF document text
    • http://leree6.club/babys_day_out_full_movie_in_english_720p7hizc.pdfIn PDF document text
    • https://durupojivuzebip.weebly.com/uploads/1/3/1/8/131856887/7e010797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388627/normal_5fe3e984d1543.pdfIn PDF document text
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/8b453a2c0a.pdfIn PDF document text
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/6992988.pdfIn PDF document text
    • http://repair-kompov.ru/funcion_de_los_alveolosqlb5w.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/zL1jgii/recargar_cubacel_desde_mexico.pdfIn PDF document text
    • https://repositugi.weebly.com/uploads/1/3/0/7/130738607/jedenudipojaguli.pdfIn PDF document text
    • http://digitalmedialit.com/xuzire79ksl.pdfIn PDF document text
    • http://mylic.ru/android_portable_battery_chargerb6f3s.pdfIn PDF document text
    • http://mangalvpodarok.ru/bafore6r3pm.pdfIn PDF document text
    • http://yourdesk.website/80313836368f9q5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5ffcce37b3c4e.pdfIn PDF document text
    • https://jexepasevotapak.weebly.com/uploads/1/3/1/6/131606223/9886750.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/iietjhk/next_business_tycoon_3_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_5fd712d5a7a98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 4852 bytes
SHA-256: eab009114eaef2a888898e7f045e45bf00777eae8074a525827f681d1cf637bf
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 11708 bytes
SHA-256: fa9e5c6965064d380a29274e9241d5976b07ebe1327376d0e030a39118577622

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