Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fe901e89e5beb4…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 13:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a7287e7686f28fe25d005d8ba3d3673 SHA-1: 78daeb590e62b6ee686872489dd47206b94174a5 SHA-256: e5fe901e89e5beb47102393722e720c99c5e0e8b945de3ccadbedf742f25d736
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The primary URL observed is 'https://zajinet.ru/strik?utm_term=warrior+of+the+light+poem', suggesting a potential phishing or SEO spam campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=warrior+of+the+light+poem
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/146cb57994ae7.pdf
    • https://static.s123-cdn-static.com/uploads/4467030/normal_5fe48eff52364.pdf
    • https://cdn-cms.f-static.net/uploads/4488339/normal_601ce754f1cc9.pdf
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5fd2d8e6eaf0e.pdf
    • https://buzoxebujodi.weebly.com/uploads/1/3/5/9/135971705/1545772.pdf
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/4c962f8b.pdf
    • https://static.s123-cdn-static.com/uploads/4452852/normal_5ff4a5004f847.pdf
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/7165896.pdf
    • https://cdn-cms.f-static.net/uploads/4502920/normal_6034f3aa38b0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kudawugijamino.rf.gd/630774128.pdf
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_ee6b391f4c954d2b89b14f763f7de7ad.pdf?index=true
    • https://s3.amazonaws.com/jasadavebaga/paid_civil_judgments_on_credit_report.pdf
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_b5e59d07ba5c4452b881f1cd878eaa08.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_a1f884225b584ee1a6b23ab66be0dac9.pdf?index=true
    • http://vevuweminofilo.rf.gd/jixezupofijupeb.pdf
    • https://s3.amazonaws.com/falevi/mumuvodejatibanisufaxumod.pdf
    • https://s3.amazonaws.com/resabomibogodaw/61430648644.pdf
    • http://xoxadexol.rf.gd/clicker_garage_opener_troubleshooting.pdf
    • http://vapasiwivomod.epizy.com/47698237032.pdf
    • http://firuwasuwubo.epizy.com/jizejuzeda.pdf
    • https://s3.amazonaws.com/kevava/kazomosedodaj.pdf
    • https://s3.amazonaws.com/wemupajese/autodesk_autocad_2013_64_bit_free.pdf
    • https://s3.amazonaws.com/savifin/intellij_checkstyle_format.pdf
    • https://s3.amazonaws.com/mizeteb/meturovur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9f.bin
8eeb3d33a3758826943106b301db823db01e85d0082bd830291f1746a779cdc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 5152 bytes
font_01_sfnt_off00010d10.bin
44e64e10c3dac959eb08d9df2f03dd62056e3c58a4900b43d06cc51646f792e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 10644 bytes

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