Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2a6c2d6957731e…

MALICIOUS

PDF

72.4 KB Created: 2021-02-28 10:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 61b55eef62e5696e0e3c1a6e1d57946d SHA-1: f4e96b1427f356a168b408f395a53e4c77cfd202 SHA-256: 7d2a6c2d6957731e68cd77526a8e14ac3edeaee122942784be7832ae8e399c17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=the+dragonbone+chair+hardback PDF link annotation
    • http://smotrikino.fun/poweriso_error_code_3229htz.pdfIn PDF document text
    • http://legiontry.online/piano_lesson_plan_for_beginners2qri5.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/idP7Bv5/13152229657.pdfIn PDF document text
    • http://sirovikokaxi.22web.org/checkbook_register_template_excel.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/33315581525.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/ropavabarelug.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/zupenafud/17792304330.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/sylvania_automotive_lamp_replacement_guide.pdfIn PDF document text
    • http://zotuzibufuvonif.rf.gd/android_studio_beta_release_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/jenevaraza.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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 5144 bytes
SHA-256: c11c99ed7d18bb56f8ff64bc04c9d4cf3e4edf4c4227b4a52b5f5bda4bfb1bcd
font_01_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 11956 bytes
SHA-256: 21cf7e76ae263565ff23c85fccc9aa313315c067e98d6b7e1cbd8278c641ca75