Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d68b96c0cfc5524…

MALICIOUS

PDF

79.6 KB Created: 2021-04-05 09:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 91157939954d1086b82a687b3955ce9e SHA-1: c2e27c2ced162e827820c34d09750177ad3e65b5 SHA-256: 6d68b96c0cfc55248c1d2d1f1a3fafccdabaa3e71c2c1219088c1c5d4da102c3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=skyworth+55+inch+smart+tv+review PDF link annotation
    • http://thedefenseforge.com/definicion_de_investigacion_cualitativa_segun_autoresd4tyf.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/0jej8hh/denuv.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/gcHhboQ/kokapum.pdfIn PDF document text
    • http://haifaiv.ru/rapekoxijowelamuxobuvewt0ok.pdfIn PDF document text
    • http://lg-copyright.com/16025270679f5bwc.pdfIn PDF document text
    • http://ru-payment.casa/2257742792lk21e.pdfIn PDF document text
    • http://hookup157.online/decision_making_criteria_matrix_template6ng8b.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/rtqifgg/leather_sofas_and_chairs_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/xagunetoxa/hi6Lnhg/online_multiplayer_shooting_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/ihiigdh/zombie_defense_2_episodes_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/9yjajj9/plex_windows_server_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/ejaMhhO/69552097911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_03af5989392b40018332399fae09e585.pdf?index=trueIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_86897e3e4fb14d298497fb6522de66e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bca8f4a-3512-4660-8b08-834f457ee9e7/artificial_neural_network_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07aa4a91-7df5-4424-a915-94a39b2b2a49/big_little_lies_opening_song_season_1.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_c5c133d24434443f93a78a61f3dc7187.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c794a22-8f59-43e4-a2b6-7e7033426828/91488790555.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_ed0d3838327041e8975377821df26323.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_06a01173ea5e49d8887545b49335409b.pdf?index=trueIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_32104ec723fc4e949a3974588a0348c8.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_e3924a1b98554e399be272ad8e3b5581.pdf?index=trueIn 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_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 5552 bytes
SHA-256: 41068cf7dcfaf8da43cd607d686452b645bf99f927617794ddf065eb3ecb6528
font_01_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 11292 bytes
SHA-256: 27b5bd40833ef10918399fd4e875a95aa10a95c4f46659bbcd8b6080dd736f22