Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c046c7be978442e…

MALICIOUS

PDF

78.9 KB Created: 2021-02-15 09:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b268ae0dca6340eb575a2a8be15e352 SHA-1: ace14e7c8836665dbe120d3d826bb8c95976c7a5 SHA-256: 9c046c7be978442e3a52a419423f0059d6cfb886b182ceb0e6ce489dc13e0a0f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with at least one identified as a link farm on disposable hosting, suggesting a redirection mechanism. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=getchar+in+c+means PDF link annotation
    • https://cdn.sqhk.co/zupololano/nwU56ge/bounce_house_for_sale_amazon.pdfIn PDF document text
    • http://zotusomadelisok.22web.org/toram_online_xtal_guide.pdfIn PDF document text
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/63e050c.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/cfb524.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/a93f0504a3.pdfIn PDF document text
    • http://copyright-rules-help.com/98451830129vr8t8.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/bZigtih/minecraft_dungeons_ps4_game.pdfIn PDF document text
    • https://cdn.sqhk.co/momebuman/4hcrDrA/final_fantasy_tactics_characters_guide.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/voxazedisula/41926874197.pdfIn PDF document text
    • http://loxosufodu.epizy.com/advanced_information_technology_solutions.pdfIn PDF document text
    • http://wuzatefiroko.epizy.com/algebraic_expression_examples_with_answers_grade_7.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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 5040 bytes
SHA-256: 20a807b7d66813b5380ebc2af8d34d7834d56254561383036e13524229c970e6
font_01_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 13772 bytes
SHA-256: afe67a9c3237bd85b1e099e9fac7792209e8696366e30702d145327dabfe6a14

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