Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3bd193026feeb0…

MALICIOUS

PDF

75.8 KB Created: 2021-05-16 05:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 203764c3380492dadc3cbbb0e9fb891d SHA-1: c9c1ff2c77fef89e3a28dec2cef54683c8892f55 SHA-256: eb3bd193026feeb0b4f96852c5ce71a2ad87b4b02dff1d1179cd0c468843515d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. Several heuristics indicate a high density of links pointing to disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs further supports this attack pattern.

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://golowaki.ru/strik?utm_term=how+many+words+should+a+toddler+be+saying PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426072/normal_604d0ffa98308.pdfIn PDF document text
    • http://harkateine.fun/pemawupunevefewavaverofolojmkw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_602a897b21fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_604da3630d8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_603cee6e08bec.pdfIn PDF document text
    • http://qlemelest.online/95607036288l4nfg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_6065c7365d99d.pdfIn PDF document text
    • http://ar-foto.art/48711216463rnzdw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_5fdcc3ec18a01.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/viwosemobuna_potuze_nibozeg.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/kazotizupof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369648/normal_5fcca6b3778b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limixawur.rf.gd/56700902868.pdfIn PDF document text
    • http://kubemumibesedu.epizy.com/89553249369.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_7f97c7bb32b4499882988b78df86a854.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_0841148fd8334873a8e14914abfbadcc.pdf?index=trueIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_755cf9468f2f45feabb6025a3805b353.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_3f7353832fb34db49c6216f37728a386.pdf?index=trueIn 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_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 5532 bytes
SHA-256: 224da4a336d2aea2c985893d60a46fe32fe3499b9fcb2e7904852964a44f2052
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 10864 bytes
SHA-256: 5456b823f9009ac3fc88802b3f22cc70ea5eb23bcb6eac686057ee4f1ba2d9de

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