Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece0ce0e55b54685…

MALICIOUS

PDF

81.5 KB Created: 2021-03-04 03:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4c52ef9e5721a34e94130c09bce19345 SHA-1: b171979f84dd76b21259b4421bc9e68611cd0aea SHA-256: ece0ce0e55b546854efa52580dfe55758741793c313fe6a67d1a68c4b4987754
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/award?keyword=actividades+de+comunicacion+para+personas+con+discapacidad PDF link annotation
    • http://tigafik.mygamesonline.org/english_speaking_eye_clinic_near_me.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/jizobesenod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423752/normal_6002febc8061b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384316/normal_5fc7463fb4bdf.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/doxoxujananox_jusawib_bafipezexejekis_kikutogana.pdfIn PDF document text
    • http://prizinsta365.website/20405720390hj9aw.pdfIn PDF document text
    • http://wdd13.ru/xezujude65o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fca9caf24df5.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/what_can_make_your_blood_pressure_high_during_pregnancy.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/mikefatarotazeko.pdfIn PDF document text
    • http://umniashka.ru/cloud_computing_architecture04rky.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/sipowatoser_garexorebexelot_nopib.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/kuligagubaturubuxuguxigi.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/dell_e6410_i7_laptop_price.pdfIn PDF document text
    • http://copyrightproblem.com/stellaris_tall_empire68l02.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/bidivo/wawuwokovajijuxowa.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/chicago_manual_of_style_footnote_format.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/7108635631.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_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 5236 bytes
SHA-256: ced7aff11ab623c313ce7b75276156a61dbaf6986c5cde428f48d83ddf840a4e
font_01_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 11960 bytes
SHA-256: b2edaebe4ad61189eced30ca6e4cd00dba5ab63bdeeddd57c76cbb592e13b724

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