Malicious PDF — malware analysis report

Static analysis result for SHA-256 350a62966e16ca56…

MALICIOUS

PDF

76.6 KB Created: 2021-03-18 13:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3e8915666e200956ed7c420e8ee4327b SHA-1: c79eb2a863c9fd0cf9832ce2e4d0e939304e7352 SHA-256: 350a62966e16ca56cbac2dd4f7421c6cf9553bb154ab58dd183639528f1271ca
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, with at least one URL (`https://vilenefex.ru/award?keyword=metabolisme+lemak+menjadi+energi+pdf`) being a primary point of interest. The document body is heavily obfuscated, but the presence of embedded URLs suggests a phishing or malware distribution scheme, likely leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=metabolisme+lemak+menjadi+energi+pdf PDF link annotation
    • https://cdn.sqhk.co/wuvitatutuv/4Ujdrgj/carrom_superstar_app_download.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/lean_management_system_certification.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/85571404616.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/ijggLij/xotivoziwil.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/danowavolifev.pdfIn PDF document text
    • https://cdn.sqhk.co/lajiwaxin/eOgiihH/lovokus.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/bharatanatyam_hand_gestures.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/agNXhgd/phoenix_airport_hotels_with_long_term_parking.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://positajugopisu.myartsonline.com/nigeria_biafra_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4138fb57-8890-43b8-b40d-ebb398d61c71/2006_gmc_envoy_denali_transmission_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/31100785286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec4b5cf-4cc2-414a-a576-3f00fa3740e7/how_to_install_mendeley_in_word_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c097ae3e-d536-4bc9-ac4c-173788e93dd5/what_is_the_most_powerful_wet_dry_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9b9fbe-463a-4203-879c-de1005b81079/dasonuxasik.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/85455344695.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/77740073250.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/what_is_a_care_delivery_organization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a5de89-9f58-447c-bdeb-4f8a0ac8ce64/22938523896.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/mr_bean_movies_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e418d68-7c80-4795-9e50-03545e01d6bc/9030785313.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/9382859700.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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5648 bytes
SHA-256: bd1a05ed67066b5f4e9f77956903c3c7ebca397ee787f7b63fb16aeccc57bf80
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 11044 bytes
SHA-256: 0601dd3f7bb5fac70c16f40a4e9181310d8b1e9dae8339334d4fff3b8ae5209b