Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3c5851038e8d2a…

MALICIOUS

PDF

74.7 KB Created: 2021-04-01 16:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 08ba6aa57c05f62ed402ce85163ab858 SHA-1: dc8ec369b4bff64b8853942a42668039e94bf082 SHA-256: fa3c5851038e8d2aa041c96b49b316e083192a0ce80c568000f2fab140514cb1
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 0.9991

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://xajibur.ru/strik?utm_term=little+red+riding+hood+characters+coloring+pages PDF link annotation
    • https://warigiwedekepap.weebly.com/uploads/1/3/4/6/134655399/4a3122e5.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/gLgfNbf/kuvexasomupawekubuf.pdfIn PDF document text
    • http://fenellalucynelle.info/root_board_game_app_storermwqa.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/dowulid_xodidapiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/ejajaHK/34849332951.pdfIn PDF document text
    • http://cetapp.xyz/dilations_worksheet_kutajawsa.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/ifhg8QA/bolufobavodaderine.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/5192520.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/sgejejd/game_recording_software_download_pc.pdfIn PDF document text
    • http://wiregabjuk.fun/tweaknow_powerpack_4._6._0_serial0mmom.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/jdy4Ihi/xutodulopedobati.pdfIn PDF document text
    • https://cdn.sqhk.co/pofevadamem/iahgWig/44682976578.pdfIn PDF document text
    • http://pro-gram.pro/28787748393amft2.pdfIn PDF document text
    • https://cdn.sqhk.co/mutavewituro/o4uwCND/nutritional_information_nature_sweet_cherry_tomatoes.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/eO0gxtC/skylanders_swap_force_characters_xbox_360.pdfIn PDF document text
    • https://bovojopo.weebly.com/uploads/1/3/2/3/132302970/5147876.pdfIn PDF document text
    • http://dvestideyli.xyz/febogisirugetijevovikadx6av.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/1826c93f-4a7f-4992-b434-e186bcc9418d/bosiwopixuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada94fa5-fa71-41a6-9483-18ae7bfc9c56/best_fitness_program_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4db4e4a-f749-45b4-9993-e4fd57b7bc2d/guxifupizamexiwamakiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d2ebb2-78c2-484c-b91f-d531791432d0/microsoft_office_for_windows_10_free_download_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02e278a-b4cf-42e7-be40-078f24bfe1c8/toro_ultraplus_electric_blower_leaf_vacuum_leaf_shredder_51681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1dbdcee-4260-4a10-989d-15d045cc4b38/how_to_replace_door_gasket_on_ge_front_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4f4e9b-b0de-4305-8e82-c6e63a49c815/franz_kafka_the_metamorphosis_and_other_stories.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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 5276 bytes
SHA-256: 66de5148eae165b286fdd96b6748ccde41c2292fbb7e772ff33d149f5fed2cdf
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 11044 bytes
SHA-256: 4ef78fba2cd114debfefa91b25ec3f02e098821b12ac25484c84f69f68c83b61