Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea677752b63e231…

MALICIOUS

PDF

80.9 KB Created: 2021-02-15 12:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9ec0906503730d84492973315ab2bd29 SHA-1: 664cd482618687c4c2c92609c3ec3dc62adef899 SHA-256: fea677752b63e23135a51714c537d9df817a08ce825660277dddb9ad71e133f2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://leonvi.ru/wb?keyword=how%20do%20ratchets%20work PDF link annotation
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/8971098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fe652feebf30.pdfIn PDF document text
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/berone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5ffeadd340169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_601e56ea920ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5fce86c49a654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368478/normal_5fe33c32904bb.pdfIn PDF document text
    • https://vixeweno.weebly.com/uploads/1/3/6/0/136049701/4263e7.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/5449610.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/nipalik.pdfIn PDF document text
    • https://nivebisela.weebly.com/uploads/1/3/3/9/133997547/73aec77ae77.pdfIn PDF document text
    • https://musokuvezuref.weebly.com/uploads/1/3/1/8/131871850/mulebawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_6024f35b27110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fd62b0eb0eff.pdfIn PDF document text
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/277485.pdfIn PDF document text
    • https://wobipogipexiwom.weebly.com/uploads/1/3/1/0/131070125/e3ab75c.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/280947.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
    • https://s3.amazonaws.com/verirejon/49102793515.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/aluminum_sheet_farming_persona_5.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_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 4748 bytes
SHA-256: 97ba2adb395941f1174b2771e67258d0a2f68d501c4b480c31891af3ade41449
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 10716 bytes
SHA-256: 417f51212a15fa569919b19ccbc3fb4d526339d8713f6574066dbc08ce63595e
font_02_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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