Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a772209f56730ca…

MALICIOUS

PDF

80.4 KB Created: 2021-03-18 01:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 43dc2644c77f56bbce0078d8a4e16625 SHA-1: 9d2c1e726c72745a723735b37428e6eb278516ca SHA-256: 5a772209f56730ca15b18527cd9dbf8f3d14ab85961103d4650dfe7ac4b4f66c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=magic+bullet+theory+media+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380384/normal_6011b091a571c.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/out_of_sight_out_of_time_ally_carter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421612/normal_5fdd0898c65ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_60278ab61ebd9.pdfIn PDF document text
    • https://todatotosikuped.weebly.com/uploads/1/3/0/7/130740429/599321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5feb94ed1e90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_6032b05f39e8a.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/S40heku/stam_chocolate_cedar_falls_ia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5ff5c8f33a909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_6018d6ace6e50.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/EEHjbia/iron_masters_country_club_rates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_60199fdfce814.pdfIn PDF document text
    • https://titezexi.weebly.com/uploads/1/3/4/6/134639754/7740278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492272/normal_60171ede56545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_6012420892ebe.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/upsc_prelims_answer_sheet_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lufopudizomuv.atwebpages.com/how_to_calculate_faster_without_calculator.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_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 5800 bytes
SHA-256: e6985b31ea2efae4fb5ed016d56b4b9c62d00953d2f4ecebe8d680b5b9542baf
font_01_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 11144 bytes
SHA-256: b7a4b8d9bdf609bc9902a3be306726375dc06ff2645723fb32d0bb6d7804e055

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