Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ee3b8c540643db…

MALICIOUS

PDF

81.3 KB Created: 2020-12-30 15:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e2d65143de496b20477fd1191a1b5de SHA-1: 7513dafa50827b436f18f7fe3d0b8f08a53da01e SHA-256: c6ee3b8c540643db80bed3a8df5e4cfad95cd193644d4c16510bb7b4373bb415
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://traffnew.ru/123?utm_term=gre+strategy+guide+pdf', are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://traffnew.ru/123?utm_term=gre+strategy+guide+pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xefafimofaxeparekuji.pdf
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fc7b0a4d4eb2.pdf
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fcec0c32d77a.pdf
    • https://cdn.sqhk.co/vogoxaginoje/rL5Lhjq/45803847330.pdf
    • https://cdn.sqhk.co/salenasova/gchfELA/tag_chaser_urban_dictionary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2a549a91-fca1-41f7-825d-99492d9746c2/97064746554.pdf
    • https://uploads.strikinglycdn.com/files/250bf3e1-cd57-47d0-b6c4-10cf8f3e1f2a/birds_beasts_and_relatives_gerald_durrell.pdf
    • https://s3.amazonaws.com/varolexexus/nikajujitipasujemuk.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/pathfinder_roleplaying_game_bestiary_3.pdf
    • https://s3.amazonaws.com/voropa/common_poultry_diseases_and_treatment.pdf
    • https://s3.amazonaws.com/ninazarila/when_did_josh_and_colleen_get_divorced.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/hanif_kureishi_interview_my_son_the_fanatic.pdf
    • https://s3.amazonaws.com/gotijejaj/bike_racing_games_play.pdf
    • https://s3.amazonaws.com/zozuxukoxo/tor_browser_linux_32_bit.pdf
    • https://s3.amazonaws.com/jimugivos/que_son_las_varices_esofagicas.pdf
    • https://s3.amazonaws.com/wikurixobelu/border_form_bootstrap_4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09f.bin
f407627be3e054db302120e5ff1a18a4dfec74b2191bcfd99b50e398fc293317		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 4976 bytes
font_01_sfnt_off000101af.bin
124a197c845b77845758b39b9b34f5679d369ada447afe208d1c34a07cb4248b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 11596 bytes
font_02_sfnt_off000128a0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 4324 bytes

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