Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2c04868c3d7f59…

MALICIOUS

PDF

73.8 KB Created: 2021-02-08 07:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c1f839a058a7c35b6615624cb217cfb7 SHA-1: af87915a74311e1acadc4ef22220ee7347e0b5a5 SHA-256: 9d2c04868c3d7f5953b804ecaed6c253cbc8fb8355356ab5304dac693deadaba
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external URLs pointing to other PDF documents. The primary purpose appears to be SEO manipulation or distributing further malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest potential for further malicious actions.

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/aws?utm_term=the+earth%2527+s+spheres+webquest+answer+key PDF link annotation
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/5525496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fce597e13426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fced7efb2f2f.pdfIn PDF document text
    • https://musokolej.weebly.com/uploads/1/3/1/3/131383826/a715f146a0861.pdfIn PDF document text
    • https://jinezivatu.weebly.com/uploads/1/3/4/6/134687025/32d7d905aae.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/e283f6f9.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/digudoxozoke.pdfIn PDF document text
    • http://temilops.xyz/batman_arkham_knight_gcpd_riddler_informantmnz0g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fe8d4e2a9d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_6018c8cf4eab2.pdfIn PDF document text
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/4083077.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/zapuvidefelata.pdfIn PDF document text
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/givejekesuf_kisilofitud.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/likenupojozo-lofosanaj.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/tutasujal/co_ownership_agreements_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/68593969795.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5380 bytes
SHA-256: f33857c5acfd2fd6dcb806ca9e2abb9dbb2f792ea31d5f190c1d6bf272ec01b0
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 10544 bytes
SHA-256: 69a6038951f3bf001dbc1088580151614896d1c943ec2e25dd433e3ce5ab9edd

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