Malicious PDF — malware analysis report

Static analysis result for SHA-256 f877434d75a26c1d…

MALICIOUS

PDF

72.0 KB Created: 2021-03-10 14:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f02f695f05c3c631f0bae91436ea0dd1 SHA-1: 21bd0392e2f047d268d7ec34f648e65573d614f6 SHA-256: f877434d75a26c1dd860ae87f491522c62b1a40ac6fcc7959d0c201a2359ccf0
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous external URLs, including one with a "utm_term" parameter suggesting a tracking or phishing lure. The presence of a link farm on disposable hosting indicates an attempt to distribute malicious content or redirect users to potentially harmful sites.

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://soxebez.ru/123?utm_term=cannon+fodder++windows+7
    • http://wemuwetafivaxe.sportsontheweb.net/metodologia_dela_investigacion_cuantitativa_santa_palella.pdf
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/rokiteraf.pdf
    • http://nibajafij.medianewsonline.com/71095592186.pdf
    • https://zisojemikema.weebly.com/uploads/1/3/1/4/131483184/8907720.pdf
    • http://vulefuxudonad.22web.org/the_poets_companion_free.pdf
    • http://vikubemaba.22web.org/ararara_marathi_song_djking.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_9f14239164024b1383314f8753ec43d2.pdf?index=true
    • http://talakukatutevib.epizy.com/36253407940.pdf
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_1a65b2f1d95c4c8baf2bc9517b36ecd0.pdf?index=true
    • https://s3.amazonaws.com/xeropizuwe/counter_strike_source_ocean_of_games.pdf
    • http://dexifuv.epizy.com/what_is_an_example_of_social_cognitive_theory.pdf
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_12d9e70b55d84de9a8668c320843de3b.pdf?index=true
    • https://s3.amazonaws.com/jipowumat/performing_arts_teacher_jobs_melbourne.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_47107b8823874988aa7552394156a9cd.pdf?index=true
    • https://s3.amazonaws.com/nuselufuzo/divinity_original_sin_game_guide_book.pdf
    • http://wamovesomawegun.rf.gd/xagisazozoturufukenesal.pdf
    • http://navebulaj.epizy.com/83656841418.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_off0000dd95.bin
4de62e17c1db7a5b427ff472bf7e88fead3c2be4f40291c7f57ad06562893a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 4948 bytes
font_01_sfnt_off0000ee95.bin
775e922a95318440844783a902d9af977970cfdaf9991a048fc296aba4b01c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10772 bytes

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