Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf057fb47e8d4e78…

MALICIOUS

PDF

68.1 KB Created: 2021-02-12 09:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 31e7f5eb7805c48d4dd85dbdb455503c SHA-1: d91aa1d64a9206e6b2a86759720fc3210cef6859 SHA-256: cf057fb47e8d4e7861e56e6688455a365c2f53659c7958d935e997adaca7b1b4
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, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'Dmx operator manual'. Several external URIs were extracted, including one pointing to 'druttle.ru', which is likely part of the attack chain to deliver a payload or redirect to a phishing site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports a malicious campaign.

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://druttle.ru/wix?keyword=dmx+operator+manual+espa%25C3%25B1ol PDF link annotation
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/645bee19524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_60221799b2338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_5fe9ed837ac7b.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/hbx2gcY/28329675585.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/ekqhhhJ/91799511189.pdfIn PDF document text
    • https://suzavopuwo.weebly.com/uploads/1/3/4/6/134686694/3c60de.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/6805406.pdfIn PDF document text
    • https://cdn.sqhk.co/favejofu/jiWZBhb/gelakesevabibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482619/normal_5fcd5f5459cf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabuxixu.epizy.com/xirarumevulidi.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/browsec_for_uc_browser.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/mevakisub.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_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 5244 bytes
SHA-256: 49b9ea1a4c930a30b829d5e288d1829368d632883b7f52206061650da9ad172e
font_01_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 10256 bytes
SHA-256: 21d51d777edeb7ff5523273c743c7c5aa0e41ae71410615e9820fef06658447d

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