Malicious PDF — malware analysis report

Static analysis result for SHA-256 263eef86e3e5a590…

MALICIOUS

PDF

82.7 KB Created: 2021-05-08 03:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 904db22a2b97d8a50ac534a4e978850f SHA-1: 16a4f0b8bbce6595d07c155fa3e938adda60fafa SHA-256: 263eef86e3e5a590a9095bafbd7cb55d41bbac8df912703121f1b9f6e5b31570
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 0.9996

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://maypoin.ru/strik?utm_term=quickbooks+for+nonprofits+desktop PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5feb51396eb20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_60391f58659c4.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/iifgf4G/patowirapaxusagu.pdfIn PDF document text
    • https://cdn.sqhk.co/wogigixa/jglhbgg/69760366307.pdfIn PDF document text
    • https://lekamenofujilap.weebly.com/uploads/1/3/4/6/134690267/bowimasitikoxufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_6024c63361e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_603b059c16dd6.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/t3gjNgj/bedoleguvuvuzanaw.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/nawuf.pdfIn PDF document text
    • https://magagitu.weebly.com/uploads/1/3/5/9/135959352/1355231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fc81443ad0ed.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/hjdQUd3/revupemorazomovokafurop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_602f5a2d18ae2.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/9b28bc.pdfIn PDF document text
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/dovasuravamukon.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/dezajok/kitevezedoguzo.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/book_club_facilitator_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a260900e-d54b-471d-89ea-e377ec82ff36/umas_wicked_book_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d976c466-143a-4725-9e82-7dadf0719735/voremoraviwipesenisobuku.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/dolokezeduwiwanet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecfa70d-119a-4275-b3c5-ab947fa189eb/zagixedenigorivisokiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27baac6-8f3f-4fc8-a9ad-b637fbbe631d/sufufoteva.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_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 5172 bytes
SHA-256: 0eb41cd699c9a3ef94154309da059724267e520de7876ddea57c090a3e6f3bbb
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 11152 bytes
SHA-256: 6c4485caa26ecf440b313f8b5738dd1e9857b1687e67c3290ea5bbbfd905036d

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