Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c9777c6de9eb8…

MALICIOUS

PDF

77.4 KB Created: 2021-05-17 00:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6f9cc6648458ddeafd61dadb7c64b318 SHA-1: 9e3a0d57487dbdab3898494b61702e889378c50c SHA-256: 156c9777c6de9eb8c16a5fddbe9846bd7cb945c1b478b3fa9cb12bb96d181dca
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 designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though truncated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points to the primary attack vector of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=elvis+presley+can%2527t+help+falling+in+love+full+lyrics PDF link annotation
    • https://tiwixuferexo.weebly.com/uploads/1/3/1/3/131380596/561118.pdfIn PDF document text
    • https://basapozixuw.weebly.com/uploads/1/3/4/7/134701575/tomuniberuba_pasikofalisez.pdfIn PDF document text
    • https://zedunuburow.weebly.com/uploads/1/3/4/0/134042823/8774072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408355/normal_5fe5c1a44c643.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/absceso_perianal_tratamiento.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/39016003520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_600f65164e24f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_601330a493104.pdfIn PDF document text
    • https://vizudenorip.weebly.com/uploads/1/3/4/6/134674315/56b0e.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/5198896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5fd2879a10030.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/vomokema-kusog-webiful.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/zepakitidujo.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/sovuze.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/pivetuzadujo/25643746790.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/venn_diagram_template_free_printable.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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 5432 bytes
SHA-256: 862a52a6aba558b24344201a0914609af32a2038b4372a33382c1b460b10fe06
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 12708 bytes
SHA-256: 35e8394706c5c75f8ac3f7e798208b25c9690b887a35e1463f3dd0368efa5b36

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