Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4d806f4af4c2a3…

MALICIOUS

PDF

77.3 KB Created: 2021-03-11 02:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3226039a0ffb8d4d26965319a6a38482 SHA-1: 2efc6be0f54ec4ea6d3d0cc7674fe64f638b62e8 SHA-256: 7f4d806f4af4c2a33463d82e66352940afdf0a4fddab85c8162f89cec3a9b411
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to a second-stage download.

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://nipisod.ru/award?keyword=banknotes+of+the+world+pdf PDF link annotation
    • http://wuramegojuluz.mywebcommunity.org/47342433267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_6048e29775777.pdfIn PDF document text
    • http://mizusugazalu.22web.org/2786208871.pdfIn PDF document text
    • http://sudebatuwilazet.iblogger.org/budgeting_budgetary_accounting_and_budgetary_reporting.pdfIn PDF document text
    • http://zujonatuvetivux.iblogger.org/pasexidazutaregadaposigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6024a36a9e2fc.pdfIn PDF document text
    • http://bobiruropiles.22web.org/android_tv_devices_south_africa.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/lukokiwimasogib.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/49908475798.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/fukod.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/marvel_comics_heroes_villains.pdfIn PDF document text
    • http://lagutobokoza.22web.org/antenna_and_wave_propagation_notes_free_download.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/bavotoxex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxezenot.epizy.com/2009_toyota_corolla_le_engine_oil_type.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_58db51c798a14fed8f09cfb824e6c1b5.pdf?index=trueIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_a3789cab168d46ddbc75cf821b436e0f.pdf?index=trueIn PDF document text
    • http://gabitotedusaled.epizy.com/abnormal_psychology_pearson.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_41ff33865cbb4f87a53b209a09af8851.pdf?index=trueIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_54ca9ffd150f4960aea776972f7eeb8b.pdf?index=trueIn PDF document text
    • http://disoluje.myartsonline.com/10534601040.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_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 5336 bytes
SHA-256: c5e8632a3334c4553805cc29df8a8c63cdc1501392438fcef0f7fb51903f09b0
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 10184 bytes
SHA-256: 205567ca3cb81f4dafd7a2947349b4d349b0f3b8625442afaec76a92917b1826

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