Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a710bf20cb5e153…

MALICIOUS

PDF

66.0 KB Created: 2020-12-21 04:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5330abff5f063db4af69303ecf1f6e6f SHA-1: baddfff8bc1cceee15380f7b616cd91a7a155f62 SHA-256: 4a710bf20cb5e1533b828873fba83f8ccd2db59d58ba19d38c427946d7cd065c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high heuristic score indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=blood+money+palette+launch+date
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdf
    • https://zivawopoxiba.weebly.com/uploads/1/3/4/3/134355714/dd244ea.pdf
    • https://fazatirogefo.weebly.com/uploads/1/3/4/4/134462354/8904347.pdf
    • https://wixozini.weebly.com/uploads/1/3/4/3/134383912/tazenenizoj_tifekev_sefube_nadowobutapim.pdf
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/pajozudab-kuzotoxiwoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdef985147b14804f7d111/1606283161092/download_the_amazing_spider_man_2_apk_obb_mod.pdf
    • https://uploads.strikinglycdn.com/files/0019f007-f274-44c1-8aad-3c9ab0d11d9e/tadovewugeto.pdf
    • https://s3.amazonaws.com/dozuga/jajow.pdf
    • https://uploads.strikinglycdn.com/files/64100a68-7b78-4372-b052-70a85eb1002b/papas_freezeria_insane_math_games.pdf
    • https://static1.squarespace.com/static/5fc64d6d2e537a05ef2dd678/t/5fd1d407fec2791e31081aa1/1607586823773/gmod_prop_hunt_mod_download.pdf
    • https://uploads.strikinglycdn.com/files/ca6824c4-dd5a-47b6-bf19-25ca9903ff7a/laxujijajivomemut.pdf
    • https://static1.squarespace.com/static/5fc6de278b9e860b7b1d6869/t/5fce67996f0099009e996cb6/1607362457658/jakevagusasokatuxipo.pdf
    • https://uploads.strikinglycdn.com/files/45c0e551-c7c8-42e1-8d61-799ffe374980/toredagerojatumo.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_off0000c4f2.bin
bc5d04d7ac6505698245aea9e0834bf5e48a33624185e8feda47aae97a5a829c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 5192 bytes
font_01_sfnt_off0000d67d.bin
8b8284a7dc019047a683cf35fa8dda151f3958f8ec276bd724a5d3e5755cb9bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 11136 bytes

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