Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a66ea900326acbd…

MALICIOUS

PDF

77.3 KB Created: 2020-12-01 19:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f8d5070020bd9548da1a490ba5e6d691 SHA-1: bc60365d46deaafee53e2ac6e160921aa3ec2a26 SHA-256: 1a66ea900326acbd75a28bd11d8eac89b732813530642aedcb96a5bb97d4b857
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=does+meiosis+create+haploid+or+diploid+cells PDF link annotation
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/5478037.pdfIn PDF document text
    • https://xaruxetadelu.weebly.com/uploads/1/3/4/4/134478950/0d13d20c20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_5f9ebafc9b47b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_5fb6001cc21a6.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/dadawovagemelup-bipebatod-nezutemej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5f9dfa623d80c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_5fb8c654e177c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fc2ca2895ef8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/semuxemakaw/2383552623.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/rorotifixatukubibuk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 4996 bytes
SHA-256: a3bb307e784fe12b20ca01f51b10f537b2d2055b64948c99d6a0c10b213a5d97
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 10348 bytes
SHA-256: 2eee2a2c7d708aa2c42b1cdad07a1afd18b4fe1aaebd7f244bff3085f9ea5625
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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