Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8898b14b97aa532…

MALICIOUS

PDF

81.2 KB Created: 2021-04-04 04:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15778cc0ce69654ac55a097e60dc995a SHA-1: 811659e6ebc1bf9541f10a35c8e852c49d41097e SHA-256: d8898b14b97aa532b41676f5fd6c47d6ee4664e940b94dfef2519926fdb3a18f
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, containing numerous external URIs pointing to disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and appears to contain junk data rather than user-readable content, suggesting its primary purpose is to host links rather than deliver a message.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=burnings+ocean+vuong+pdf
    • http://xizugef.medianewsonline.com/accounting_and_financial_management_tutorial.pdf
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/3601541.pdf
    • https://gusovegexu.weebly.com/uploads/1/3/1/4/131453321/946071fca8336.pdf
    • https://cdn.sqhk.co/rubovadu/Dijthe1/lezol.pdf
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/narus_vodapil.pdf
    • https://cdn-cms.f-static.net/uploads/4406501/normal_602374c05f638.pdf
    • https://cdn-cms.f-static.net/uploads/4374379/normal_603606f97ce7e.pdf
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6043bd7ab53a6.pdf
    • https://cdn.sqhk.co/xumesapaxoku/aLCKgij/vuwol.pdf
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/ea783cfed1e.pdf
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/6d1714ab70a95b.pdf
    • http://maxiteguf.medianewsonline.com/public_finance_and_public_policy.pdf
    • https://baxuzenaxifo.weebly.com/uploads/1/3/2/6/132681834/sodijotobabure-roviledese.pdf
    • https://nuluvefum.weebly.com/uploads/1/3/3/9/133999802/guzawuzixomoz.pdf
    • https://cdn.sqhk.co/kidimezamos/ijj4iic/79456472977.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/9464028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tulosa/fanefokofuponoxomuko.pdf
    • https://s3.amazonaws.com/sefiwegegagu/hitchhiker_s_guide_to_python_packaging.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf0.bin
8d5e4b021403bccdd98af2b13f89035fe88f9775953bdfdba3b753b958aa169a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 5400 bytes
font_01_sfnt_off00011070.bin
5365ac49a9b986890272a56ff6ed8092c28fe10e05c71f0ad1b2553c1a8ae4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 11044 bytes

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