Malicious PDF — malware analysis report

Static analysis result for SHA-256 1452187adcb15204…

MALICIOUS

PDF

65.0 KB Created: 2020-12-24 03:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d46c25aa89cec48a1a8cef42b1da9f76 SHA-1: e684f58551c3988b2846195ab5f299e47d033acc SHA-256: 1452187adcb15204abade221616dd5ed4a10a95efd8fd174ecca08bb90100897
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link farm and impersonates Facebook to lure users into clicking a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are part of a credential phishing scheme, likely leading to a second-stage payload or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/eceaff40ded6.pdf.
  • 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://trafffi.ru/strik?utm_term=facebook+messenger+check+mark+by+message PDF link annotation
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/eceaff40ded6.pdfIn PDF document text
    • https://femekeviwafuga.weebly.com/uploads/1/3/4/3/134345727/temenot_sozexem_potogurobudu.pdfIn PDF document text
    • https://nogefarixuri.weebly.com/uploads/1/3/4/6/134647247/9895951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5fbc6c24879f4.pdfIn PDF document text
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/8017056.pdfIn PDF document text
    • https://xuvetopugoseja.weebly.com/uploads/1/3/4/4/134484667/podupotoj-levogesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_5faac93f60e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fa8eaf6d36c5.pdfIn PDF document text
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/d411819ac9779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5fbed6681af9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a176a5-b5db-425b-b730-c642e053120e/what_is_religion_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4da4ef-cf53-4f73-bdf9-4ec1c20d3bf9/vadiwumulugakaj.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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 5444 bytes
SHA-256: dfdbfa20c70ad0b79878a7ef44649306a5373893545610978323e6b7682ef2be
font_01_sfnt_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 10272 bytes
SHA-256: f603052867f288ee39b2894f22143015ed3366665227fba35edf6d3a39e09779

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