Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46c0c7240a7efa7…

MALICIOUS

PDF

77.4 KB Created: 2021-02-21 04:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e1f45a6e01c4863f7f6842c5a3b7fe2 SHA-1: bbd5e073ece25460a1b06122fe4d4650e72f3a62 SHA-256: d46c0c7240a7efa723ce0d2f857458170638c00c1d45a2b50f80859aaa4e81dc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links to disposable domains, disguised under a seemingly innocuous topic of rigging live bait. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics points to an attempt to redirect users to potentially harmful 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://leonvi.ru/strik?utm_term=how+to+rig+live+bait+for+bass PDF link annotation
    • http://dektesheff.xyz/zakufijutextmev3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_602998c7c285b.pdfIn PDF document text
    • http://ooovseanalizi.ru/3478910029600mpi.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/eojbjgf/21410999832.pdfIn PDF document text
    • http://introdom.ru/50412579690po9rm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_60250c6971040.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/bgchfod/drum_machine_pad_controller.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikifabaf/gg1iajf/modern_warfare_trophy_system_cruise_missile.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/gPgf6NN/heroes_of_land_air_and_sea_faq.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/jcGggf3/25459236481.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_5fc6df43629f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_6018860868fed.pdfIn PDF document text
    • http://kikudesazogug.22web.org/60102557446.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nuxumejaxumem.epizy.com/campbell_biology_9th_edition_unit_1.pdfIn PDF document text
    • http://xetoluwe.epizy.com/jilamaxij.pdfIn PDF document text
    • http://virujafaxamer.epizy.com/how_does_weekend_jail_time_work.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/calling_bell_sounds_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 4872 bytes
SHA-256: 6541f4ee684707ff47acb0d35f56e25ceee1d0d418a5b92808b5607f061034d5
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 10692 bytes
SHA-256: 5f2f31359be8e304dcf48f5a06ce6aedd167e3d2403a0a14baaeb3b456c59991
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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