Malicious PDF — malware analysis report

Static analysis result for SHA-256 834e177b08829f9d…

MALICIOUS

PDF

87.2 KB Created: 2021-01-12 14:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 695588cd2c47e65043151dd23a6e02f1 SHA-1: d8539144f075ad423c1b1f78dc517f88d3ab0d64 SHA-256: 834e177b08829f9dc3106c30c4752305f5776b6a70d76bd873e529f85606352d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/aws?utm_term=mystic+messenger+v+route+good+ending+guide PDF link annotation
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/vorepubikob.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/hgRicpU/zuzitakogemoxesitozuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fd788f5d85f2.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/Oihgiig/best_football_team_manager_app.pdfIn PDF document text
    • https://surudebed.weebly.com/uploads/1/3/4/5/134513173/namurefewotet.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/3506812.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/2910608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_5fd86b331f2c6.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/sowirutelevolur/niruxegovizamam.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/viwetazufafog.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/method_validation_protocol_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 2972 bytes
SHA-256: df9c57e75ffac9d14ca8889c3e55fa61ab7f068d826100da902cbd43eafd38cc
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 5184 bytes
SHA-256: 7495467b7180c949681f440dd0df5e8a5279d6980ad1c02deb14c41fd2d81814
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 15084 bytes
SHA-256: 29f7bc4f45b4e5e08dce2555f47a0dda337987b40f23d618c3396fc890d92435
font_03_sfnt_off000138e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 16284 bytes
SHA-256: ca88b0ccdb91e8d03b493ca442e89220e289bf7fe41b007f1114dc7cf8b3a470

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