Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa463d2f9eaea8a…

MALICIOUS

PDF

74.8 KB Created: 2021-06-09 01:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9dc344c2e3ecf983db7ef158c9ac1b44 SHA-1: 1275b031a0c6b4216232b5c10190a18783b7d9f0 SHA-256: 8aa463d2f9eaea8ad9d6d298389867db584267052cc0dfcc58e271fe034891b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://queure.ru/pbw?utm_term=kamba+ramayanam+tamil+pdf+free+download PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijozuzapusa.pbworks.com/f/45406394626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55217447-6622-4339-840c-9b3594691530/zopogonixuvimijonoxisep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18663ce2-cade-4608-9bbe-450c5e223069/wefepavoxorimukerurusajap.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/w/file/fetch/144421812/intercultural_communication_concepts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6354bd97-2b84-49bb-9434-22953dd7a513/sennheiser_ew_100_eng_g3_wireless_microphone.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/w/file/fetch/144734127/45162200925.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/f/el_conjuro_2_pelicula_completa_en_espaol_latino_pelisplus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06922c51-ee8a-4461-99ac-4c483dd3278e/best_appliance_repair_company_near_me.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144521982/herman_miller_mirra_2_user_guide.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/26801830172.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/canada_visa_lottery_2021_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f55319f-f04b-421a-a6e7-87c43b8851b8/what_is_the_best_computer_to_buy_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08276e89-8f42-449b-be07-2f8cd7aaebd0/zavakizuxuzudukegaxasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f0072c-7e82-45f4-aebf-a8286c6b83e5/kogepituguzixuvipel.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144895347/watch_holes_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cc4c4d-e0c3-4502-b5ea-6f188f5a8e9e/cissp_for_dummies_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6150957-a018-4060-be12-a69a4ed96031/42326791115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b1d324-aa88-496f-92c0-824a5b808057/53940288862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d298c8a7-e556-400d-baed-7341decb5676/sat_english_practice_test_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998239ae-6f11-4ea2-b210-c57626646c86/how_to_look_up_drivers_license_number_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fba54f-6178-42f6-ade4-c361b4963679/marble_run_ideas_with_toilet_paper_rolls.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144681558/wuwevo.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/w/file/fetch/144451158/nisiboxesanuken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5245c4-2b44-4c41-953f-b3570d156afc/dufujob.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_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 5312 bytes
SHA-256: c4cb9a11ec4862e11412643c06cfbc588e6c33e3be95ffc30dba12188ab04d44
font_01_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 11316 bytes
SHA-256: 6170dcedcbe0d1777aeeea17a52494017783198c35409659b200c1d1e73ed7e4