Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6424e0b32bd10fd…

MALICIOUS

PDF

74.4 KB Created: 2021-03-24 10:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1888713e9123eb715a902f824f28935a SHA-1: dddc9a630e56105557cca208fc8366695d62fd45 SHA-256: a6424e0b32bd10fdf7d6d53c1992ae27aefcb4468b747fdbb4e91bc56aac3379
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/strik?utm_term=what+is+linear+versus+nonlinear PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388174/normal_602ff92494458.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/jgcchzv/50th_birthday_cake_decorating_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/jgjnsie/wemaka.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/jurnal_psikologi_tentang_adversity_quotient.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_6041630cefc7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_602506da966d9.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/zabareloxidibotagajozus.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/jihjhfs/todawadoxuf.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/cxigjeG/33712331932.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/55866022293.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/pafiganovavi/jadoxefafijazujowosubele.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_128775f4b87e483292f75c2b7ad9ea61.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_b41dc827f37b4b0a8e72412201096ecb.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_ae6f622fe9aa4145adc23d1c01e660d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/payroll_error_letter_template.pdfIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/83447540092.pdfIn PDF document text
    • http://desovizipelo.onlinewebshop.net/judy_blume_freckle_juice.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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 4848 bytes
SHA-256: 05ae45834f55b35de8a31704de918eaf8fabc59fcabfb6ddea1585ece5839a40
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 10852 bytes
SHA-256: c5b2a0fe3009adbcd809aee8763103860285683b5c639ea682bced8bcb797372

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