Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f62c8173a0583e…

MALICIOUS

PDF

98.5 KB Created: 2020-12-04 03:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e571d969b2534fe12bd9e718fa0e7940 SHA-1: bd00100156d7e6bc36b668abe0f88644030e65b5 SHA-256: d8f62c8173a0583ea73c874e3b31d6979bcee2e188ad8f0054645ef27a4862e0
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, indicating malicious intent. It contains numerous external links, suggesting a link farm or phishing attempt, with one URL specifically mentioning "chief information officer jobs uk" to lure victims. The PDF structure and embedded links are consistent with phishing campaigns designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafffe.ru/aws?utm_term=chief+information+officer+jobs+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5f8fcb0b695a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_5fb44e8831015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_5fbd272dadfa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fb861a74fe7d.pdfIn PDF document text
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/4937876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f90f30bae3cd.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/3538618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5f8f985bc4293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_5f9c8ed4ad398.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/f12fd546-c297-4468-a99c-0226af7e3078/engineering_mechanics_statics_14th_edition_hibbeler.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/garde_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34cbe1fa-97a4-4573-b27e-0dd6f93268be/84397512489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc247f3-a8ec-4e90-bce1-94875614d30e/fikigudodoretejezosifeba.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_off00014553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14553 5272 bytes
SHA-256: 5fe1372d59600a14e9874091d2b90ecdb4e15a909271e79a1a89608e095247d7
font_01_sfnt_off00015713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15713 11252 bytes
SHA-256: f16a3c4bd035c74a938789361bcd77fd2004b223bc428adb3f477ecc87242dc4

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