Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c9895f85f960bb…

MALICIOUS

PDF

75.5 KB Created: 2021-06-09 16:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 34233254c47c80728eed1d70356f4f25 SHA-1: 66405a6bf714b5518cac6caa2e724b70f8f50db1 SHA-256: 42c9895f85f960bbc4c0c5e7fccfd29882cb8564cd73bb44816098290d9d87af
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable domains or services like Weebly and Strikingly, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/pbw?utm_term=cadaver+exquisito+pdf+agustina PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471513/normal_605ba54d1f86c.pdfIn PDF document text
    • https://vozupawugenebib.weebly.com/uploads/1/3/0/7/130776609/8701288.pdfIn PDF document text
    • https://pogupevupawigo.weebly.com/uploads/1/3/5/2/135293313/2396662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_603c1d31189e3.pdfIn PDF document text
    • https://supixevobaje.weebly.com/uploads/1/3/4/3/134356264/9756046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_5fd7cb6577067.pdfIn PDF document text
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/marofifixumif.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/2933319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497687/normal_5ff2025e07ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_601e8b1a975e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_60c0321f26ef7.pdfIn PDF document text
    • https://jolofoda.weebly.com/uploads/1/3/3/9/133997157/1433846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_6059a8697fba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_606800c99c149.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/51adca71-aece-4e23-a13c-c8ac2626fbcb/zadawolobawubunalunako.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/w/file/fetch/144450579/teoria_endosimbiotica_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77024620-f798-4c6d-87a8-25750e4844a8/tedimuru.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/54140865268.pdfIn PDF document text
    • http://buxozobodu.pbworks.com/w/file/fetch/144727146/what_are_three_examples_of_inorganic_substances.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45fcba45-2525-4083-b0dc-79e6d17f574c/gogoxebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c510b7-e956-4cef-85ec-e9f398b37329/7809950368.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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 5336 bytes
SHA-256: 5385a7a30e1dbb82c4ce58c3bf3eb7df49a5983c2a1192616461d61c43d62cf6
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 11292 bytes
SHA-256: 22c0d9a58d7406d22960468a45f5b4315891c4351707cb946d37d50a73965cbe