Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba19eb70ccec8ab…

MALICIOUS

PDF

74.8 KB Created: 2021-06-15 11:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e051f0b0e010289eed5384ca6d715f4d SHA-1: 337d5b36bcf60441f1a1787d6ca7156a9cda72d3 SHA-256: 4ba19eb70ccec8abcb3692e56009e015e8b72bec4e10675bf37c9d69ec1a9f34
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection scheme, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=gta+5+best+bulletproof+car PDF link annotation
    • https://diwapaxifok.weebly.com/uploads/1/3/4/4/134488462/f59faadc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6031481e5f38b.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/dolamenagoxem-menifamunogowe.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/tuvapegol_fuluwanemukawa_zazofimowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460233/normal_60be3c7d51a91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fcee94b7314f.pdfIn PDF document text
    • https://sifimimufiwiz.weebly.com/uploads/1/3/4/0/134000394/gagokopokaxiges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5fd8d12f7272c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405206/normal_6006664539438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_6009dae9363a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_601a4a85e0d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_60175fc5942ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_60593c690d155.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4484363/normal_60b2630175f91.pdfIn PDF document text
    • https://gamaditer.weebly.com/uploads/1/3/4/5/134583337/xitimabugig.pdfIn PDF document text
    • https://gomarevijupa.weebly.com/uploads/1/3/4/5/134585171/dogufazebag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_60be37d78c175.pdfIn PDF document text
    • https://xikiwideb.weebly.com/uploads/1/3/4/7/134730665/wukinuvaxosaxit.pdfIn PDF document text
    • https://fapirezomamu.weebly.com/uploads/1/3/4/3/134382700/16f26e79fd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4455387/normal_60b05bb9a9271.pdfIn PDF document text
    • https://vafeperaj.weebly.com/uploads/1/3/4/5/134586379/1742475.pdfIn PDF document text
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/gabidaxitovevadexejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5304 bytes
SHA-256: 0ebd8e57216a73c58fdd74352e61e27b26e09e0372fcf37b432ed42e7a37d60f
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 11376 bytes
SHA-256: c4343450050493fb839d6b29afede69a6e3674b2ffd57713e78955c81e23c8f3