Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f450b99a075179…

MALICIOUS

PDF

65.2 KB Created: 2021-02-11 08:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 24f38fe3574a9c521ada3a16004b517a SHA-1: 10bf588b66fe971895acafc440f515717494ff38 SHA-256: 07f450b99a075179c6bef168c3ebbf0de579abee6f1110ba8aa46c63ed881ab0
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

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 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://bologen.ru/wb?keyword=spolsky%20sociolinguistics%20pdf PDF link annotation
    • http://rubyshup.space/91686697574xbwh7.pdfIn PDF document text
    • http://dafusunefu.iblogger.org/nesigon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5fe2e6bb7b1f0.pdfIn PDF document text
    • http://vanlit.ru/30752095566yhkc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_6005d24be55b5.pdfIn PDF document text
    • https://cdn.sqhk.co/kolazapikib/gjhujba/30460055196.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/hFS0gjX/kujisam.pdfIn PDF document text
    • http://wadopipojadali.iblogger.org/hep_c_treatment_guidelines_2017.pdfIn PDF document text
    • http://musofiron.ru/xaxizuwowoziretebufemo9b1ye.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/genijusemu/fusionfall_guide_items.pdfIn PDF document text
    • http://wolaniloko.epizy.com/15080481602.pdfIn PDF document text
    • http://fisejotigu.epizy.com/conclusion_for_biology_lab_report.pdfIn PDF document text
    • http://winikejotediteg.rf.gd/12253097440.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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 5284 bytes
SHA-256: 47afaf7a60beeef940f2c54a1f9737837b270be7559aafb8e75f61cd294c1a1a
font_01_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 11036 bytes
SHA-256: 49b53c3c0b341fdda616f16b720f11974152ddf176a5211abaa1997942afae4c

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