Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8223c835b3ad311…

MALICIOUS

PDF

68.2 KB Created: 2020-11-30 20:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dcba255f7193712d1cf67d46c7520ce6 SHA-1: 17f56cae461f76011c2d5734193763c40d2afe8c SHA-256: c8223c835b3ad311e06b65ace0fbf77373e210bd55447db0dc252aab9144d1be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

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 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://trafffi.ru/strik?utm_term=reconstruction+study+guide PDF link annotation
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/jovunikixu.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/mofep.pdfIn PDF document text
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/913801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_5fab268582290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f9463b73e923.pdfIn PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/ad6ff7f7d7c9.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/c83b26768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc18272ff13940aa243ecad/t/5fc2bdfc3570fb44d15d4df9/1606598140947/mmpi_practice_test_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996e9b59-6dac-45ef-bd9e-5433267b7ff8/46949554942.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf301f3de5e49b5298667/1606284033636/kijasadizenubogeti.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd085668bfc51861696edc/1606223959269/lakawekejepa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15df1e9fc3622d5255c20/t/5fc451f8fa04221c71a96f65/1606701560561/32277532231.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb2568bfc5186167bde3/1606220581622/eagle_scout_religious_letter_of_recommendation_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a774136c-1efb-411a-b6e4-dba95f8a871e/subnautica_sea_treader_path.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_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 4976 bytes
SHA-256: 43ed9f373df7b8194f6453a2697ee6740da3c48605533d71222a0b71b3ea98c0
font_01_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 10404 bytes
SHA-256: 21b121d447100a2d29d70839da3176edb124b8e91008ed2bbe58cebf1657f23c

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