Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc176f5e790e2f5…

MALICIOUS

PDF

71.2 KB Created: 2021-03-10 00:38:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d1a0565466227d3d2d6a7f355b49c712 SHA-1: 12e7028f2dc31ad5391fccf6768c8b9a3cb2012f SHA-256: abc176f5e790e2f5d6c481417b6a81858adb053cceb445f01fa41bb5b5de9c5b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/wix?keyword=avanti+elite+gas+oven+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471091/normal_5ffcb8f94830b.pdfIn PDF document text
    • http://nextauto02.ru/fimajelutark1p.pdfIn PDF document text
    • http://ukranews.site/lezijelveb7.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/how_fix_a_dishwasher_that_will_not_drain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_602763fec946d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fca4b191025b.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/el_proceso_de_investigacin_cientfica.pdfIn PDF document text
    • http://ttop-shop.com/do_payday_loans_go_to_collectionsvfixq.pdfIn PDF document text
    • http://wgathering.org/15649763449pwigm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_602db367e07b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416496/normal_5fe03cc1bcb0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_604157b240524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_ccd29ba02743410886b8eeefe4bfbb99.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_8cbff0ea1c41456c8f3e7a35b7f14f4b.pdf?index=trueIn PDF document text
    • http://wutejaxevewef.myartsonline.com/22_clues_cheats_level_5.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_d3e236fb75cc4a6fa338b92f42c76ab4.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_bb80f9cf484f4a539cfbc293d807b120.pdf?index=trueIn 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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 4960 bytes
SHA-256: 8cc141a37e0ed096ef25b7d8bc82e5c18f7f53f039f0ffea47b585e7ce18516e
font_01_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 10116 bytes
SHA-256: 1b4d56c2c6296ea5f0b1250b7a043fa7da5329e0869e42f29fa46514d0e04b48

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