Malicious PDF — malware analysis report

Static analysis result for SHA-256 443ddf7a176eaf57…

MALICIOUS

PDF

115.2 KB Created: 2021-05-12 20:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a0d31cd330b462945997b037a6ba13a7 SHA-1: 516cc0f8aa6cabb57e05d84c774cf759460bd2aa SHA-256: 443ddf7a176eaf576a2b1093922b012dc662ce57ebfdfcd77c8f663e5108ad3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious sites, such as the one found at 'fokemale.ru'. The presence of embedded URLs and the overall structure strongly suggest this document is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=power+book+2+ghost+episode+6+soundtrack PDF link annotation
    • https://cdn.sqhk.co/votezevon/Lieejaf/tiwegalid.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/csiXaoh/23856312619.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/johfMgc/mevaxudoxamubug.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/9f00b.pdfIn PDF document text
    • https://pegogelixuj.weebly.com/uploads/1/3/0/8/130813965/koxajimaju.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/KRieLii/super_hexagon_free_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mobubivifa/pjbZLwE/cake_design_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jhjcugi/chess_online_2_player.pdfIn PDF document text
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/futux.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/7jafSGM/rufupigazikimopof.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/SKgWhgK/wudubim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4904a605-2cf1-4174-9475-338c18944f62/nesco_pressure_cooker_cooking_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d9556d-3f7c-4cdc-835f-0b001e49e039/95966561194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d91ad1d-5ff3-4123-b75a-dfc542e95bff/16567382001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7566d567-0609-4158-823a-16f96f6693a7/zemixadazuminuburisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea9d03f-2772-4f7e-b43b-9774f6abfa3f/diablo_3_necromancer_corpse_lance_build_season_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8622cb33-3715-42a3-a379-01317342a8d1/tenanaredodatezoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6697002b-e67f-4e83-b373-54ec51c359ea/48688228900.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/fezasurigemijosinab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95202724-e0a7-4a2a-a0ea-2fccf00ec231/how_to_use_keyboard_as_midi_controller_cakewalk.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/migraine_treatment_guidelines_aafp.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16432 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off000174ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AC 5884 bytes
SHA-256: c4d76b5c7288ab4854428cfd3ea8a54b8fa04225d17539df301eec1af6fe9032
font_02_sfnt_off000188bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188BC 2456 bytes
SHA-256: e58328ff8e78425227fcdeadff4f2079f78bc674719609cd5d60ce437e506bc1
font_03_sfnt_off00019395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19395 12652 bytes
SHA-256: c30decd5564fa7ec1d80d9b70e19423115a0b912f8ba693d6cc779c3abf1f345