Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a2382cae912294…

MALICIOUS

PDF

73.8 KB Created: 2021-01-28 15:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c08f1257f402973de2079365d5355968 SHA-1: 42de9f0d91eb9c013ab944d4538090033838fc9a SHA-256: 77a2382cae912294f5806aa65c36c89f8e596f1b130d8b3a9c4757e6bd26b8e2
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though partially corrupted, contains metadata related to wkhtmltopdf and a misleading title, likely intended to disguise the malicious intent of directing users to external, untrusted sites.

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://druttle.ru/wb?keyword=fall%20guy%20tribute%20truck%20for%20sale PDF link annotation
    • https://rilobajivevet.weebly.com/uploads/1/3/1/4/131438099/748f98542558b.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/45651707082kd94p.pdfIn PDF document text
    • http://callipakk2.site/gta_san_andreas_karakter_deitirmemz07o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_5fdc79783caec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5fd8b126a84b2.pdfIn PDF document text
    • http://kpupnov.pro/27042584187dfww4.pdfIn PDF document text
    • https://belonimilulufaf.weebly.com/uploads/1/3/4/4/134403367/rezoxit_warawiz_diwiraza_muxirokeval.pdfIn PDF document text
    • https://gepulepefuxogu.weebly.com/uploads/1/3/2/6/132683228/2e7f2.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/tazibabebamep/avg_for_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/futupakej.pdfIn PDF document text
    • http://ruzoguniwu.epizy.com/aadukalam_songs_masstamilan_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/comprehension_worksheets_for_second_grade.pdfIn PDF document text
    • http://pagupim.epizy.com/materi_descriptive_text.pdfIn PDF document text
    • http://rofizamomu.rf.gd/iodine_test_for_polysaccharides.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_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 5312 bytes
SHA-256: b962a518b65d53023ca6ff72f6b73aacbc99ac2d41bec08989971b9a9474113e
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 10568 bytes
SHA-256: ef77be42cbcb06abdaac020d57a8e6053eeae9c4353649ab6f007c2602e9f3e8

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