Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ecc4291df7a18e…

MALICIOUS

PDF

72.2 KB Created: 2021-02-17 22:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ef5abbb365e735a47eb0512a97789f48 SHA-1: 9a4c84a1156b0f487f6932e54ee7c411785e01a6 SHA-256: d2ecc4291df7a18ebb9c1c7f96d7c2a5921be7de06d4b1c5b125427d893f0c5c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('maypoin.ru') and another to a link farm ('cdn.sqhk.co'). The document body, though heavily obfuscated, appears to contain metadata related to the file's creation, suggesting it's a wrapper for malicious links rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=ge+spacemaker+xl1800+magnetron+replacement PDF link annotation
    • https://cdn.sqhk.co/gevopobi/br3jcqp/oxygen_levels_normal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_600fb3149f706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_6026d4b1a7312.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/1IXibja/57541168258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fe23aafd4381.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/jniiqba/japanese_robot_cartoons_90s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_5fccb7c921631.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5ffda6f38c07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_600d7b0d60a65.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/hickifN/totizizejesarekadivakef.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/tesodagiwor/94268490007.pdfIn PDF document text
    • http://rodobokojezaga.epizy.com/driver_booster_para_pc.pdfIn PDF document text
    • http://didajuna.rf.gd/bavajom.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/91674487665.pdfIn PDF document text
    • http://posazexemonepen.rf.gd/24020408078.pdfIn PDF document text
    • http://diwevobu.rf.gd/angiosperms_information_in_english.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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 5804 bytes
SHA-256: 3bacfb51956235cf34f8b2df5581f2a6267580218fd44fd66673fa069fd74a05
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 10016 bytes
SHA-256: f77a12d8f1fbf5830a55602cde9651e1dc26463247b6e8171f6863e6ed6c163b

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