Malicious PDF — malware analysis report

Static analysis result for SHA-256 1233f6793b236dfb…

MALICIOUS

PDF

80.2 KB Created: 2021-05-02 03:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a3bcd652b510e5eb7e0436183277206f SHA-1: 3d44249244724e9974edceaecec67890cf480c74 SHA-256: 1233f6793b236dfbc411870ca596c487a09f1fb1fe1680ac527866a05f78d8e3
126 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The document body, though heavily obfuscated, appears to be a lure for free audiobooks, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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://vilenefex.ru/strik?utm_term=the+wicked+will+rise+audiobook+free PDF link annotation
    • http://dressnbuy.com/how_to_use_a_tempa_dotcybv6.pdfIn PDF document text
    • http://findattime.com/arnold_schwarzenegger_bodybuilding_encyclopedia_download7gnwo.pdfIn PDF document text
    • http://submonster.xyz/47032110234xmaa9.pdfIn PDF document text
    • http://tufilevazoropiz.iblogger.org/39230447278.pdfIn PDF document text
    • https://misevitazivizux.weebly.com/uploads/1/3/4/3/134376704/521d020b87f3.pdfIn PDF document text
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/2379961.pdfIn PDF document text
    • http://velesvoyage.ru/tweenlite_scale_transformjo409.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/manuvekakoxete.pdfIn PDF document text
    • http://7evenrp.ru/is_harry_potter_and_the_cursed_child_book_82dm9y.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/de165c73-4230-4f6b-9271-c4857c425332/stanley_fatmax_level_set_screwfix.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/short_adventure_stories_in_english_for_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67612520-a5c8-444b-b5d1-a62f7579157f/patterns_of_world_history_volume_1_3rd_edition.pdfIn PDF document text
    • http://dipuritaxuxok.rf.gd/fuxiwelidesinomawakugenus.pdfIn PDF document text
    • http://sidiwen.epizy.com/dispute_charge_on_transunion_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/tibco_jaspersoft_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/the_guitar_grimoire_book.pdfIn PDF document text
    • http://wonupeleguj.epizy.com/fuwogubujuvetolobur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5501c58-4b43-4c7d-9d5a-c4b49122a085/besodamuvofibisonuma.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/how_do_i_setup_my_panasonic_answering_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/59843671226.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/ata_carnet_user_guide.pdfIn PDF document text
    • http://puzuwekamem.epizy.com/skf_needle_roller_thrust_bearing_catalogue.pdfIn PDF document text
    • http://jikelofov.rf.gd/lease_assignment_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fef8a7-8888-47d3-9699-04e15a1c93e9/mobakijafaxesurewituna.pdfIn PDF document text
    • http://ralenosozizog.epizy.com/xetilaxedejowovom.pdfIn PDF document text
    • http://zavukazena.epizy.com/world_politics_trend_and_transformation_17th_edition_free_download.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 5352 bytes
SHA-256: 0bf645ce7d61d356da486f4c242f1c6fd0bdb79f46eaac5e8807e3a1c3162fad
font_01_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 11148 bytes
SHA-256: fab109b684b1bf157fbc2131637c45cdf6b32ce4de39e5173a1010d2a326861a