Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9edd0cbc559c81a…

MALICIOUS

PDF

71.6 KB Created: 2021-03-26 07:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8dc171e9bb9a88a8bbddc71e422c1585 SHA-1: 21a4e03f1e01a01fe9a34f88850de7eeb6de8d43 SHA-256: a9edd0cbc559c81a1718cf51d6ce333c3e9fdd5089d06ebc9943fbe380b50ef0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://xezojetit.ru/123?utm_term=answerphone+albany+ny', are likely used to redirect users to malicious content or phishing pages.

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://xezojetit.ru/123?utm_term=answerphone+albany+ny PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460972/normal_6051c2dc115bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_600e7593425cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481272/normal_6025a4b5a6188.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/pixiwevulep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371790/normal_600495d54d18c.pdfIn PDF document text
    • https://legelopupusida.weebly.com/uploads/1/3/4/3/134350366/41e65fa.pdfIn PDF document text
    • https://wetuwene.weebly.com/uploads/1/3/5/4/135400298/f892c669.pdfIn PDF document text
    • https://bokoxopeke.weebly.com/uploads/1/3/4/2/134266118/983d7ad48389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_60586c6aa20e1.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/6292565.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/nuturalawi.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/9986439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_60182fb37b64a.pdfIn PDF document text
    • http://jexufiw.iblogger.org/cara_membuat_cv_dalam_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_6002f91193be7.pdfIn PDF document text
    • http://mutinujevax.22web.org/bloomberg_energy_reporter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_617ab26f77b640c2972e1ba0361b4a98.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_84f33227551b43069e2b9276e94d5249.pdf?index=trueIn PDF document text
    • http://nojudadosuzaxi.rf.gd/63718821110.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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 5228 bytes
SHA-256: 86246e8a9c005835a7b629ebca681b94f89d46381581180c8b646bb519e3d1ed
font_01_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10756 bytes
SHA-256: bd461aba391a9a17078044e11fcc249c8aa0384d5d0d65bebf1dcdd1d831a6c9

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