Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f99ff960e499b9c…

MALICIOUS

PDF

73.7 KB Created: 2021-03-24 20:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 491995688f128afba2ea1dc6db4e717d SHA-1: 836102b728724e4f33576e3c7a99ef80cccc8d42 SHA-256: 7f99ff960e499b9cc9f1a7fc3492a1912df6105888a5b3a02acdb779ef56e39b
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=ischemic+stroke+guidelines PDF link annotation
    • https://cdn.sqhk.co/zupuguvawaj/8hepUgi/dragon_quest_x_switch_review.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/a36c73.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/tokopulidutowubuzixajazo.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/muwasubaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/qEE4geE/femasob.pdfIn PDF document text
    • https://numojuwavusori.weebly.com/uploads/1/3/4/7/134728722/2895810.pdfIn PDF document text
    • https://cdn.sqhk.co/bojiluxenome/a6ia2ie/78394773142.pdfIn PDF document text
    • https://nilazarokidimud.weebly.com/uploads/1/3/4/4/134495838/a88fc56d3.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/chg3Big/fejupabapiromuridejiw.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/jjttpjb/busujirebesumi.pdfIn PDF document text
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/tadixal.pdfIn PDF document text
    • https://lojijuzirikoza.weebly.com/uploads/1/3/4/5/134593465/8902043.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/hhhjyia/93017917638.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/dgjgNha/rawirurozize.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/dghwK78/best_animation_movie_maker_software.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jguzPge/free_printable_emergency_contact_list_for_business.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/865c2027-72c0-42ff-8be1-9070967fddb5/do_tires_go_on_sale_on_black_friday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbff09b-065f-417e-bf00-4847e340604f/how_to_use_avaya_one-x_softphone.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/vobevajabe.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/universal_laser_systems_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68bd4c2-276b-4dab-b250-3876da6d6430/90205136334.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/angie_rolling_stones_guitar_sheet_music.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/history_of_britain_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28314c2-58b5-4fbc-aab2-288ae9103114/82475943371.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_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 5144 bytes
SHA-256: 3c40ecd66490f8d1b8482d7cc7d302b01222f6e4c18f69d6787890bd157fa7bb
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10440 bytes
SHA-256: 7d644aa281d3dc7e5e7f458069101cde46a4025e4ec4f789c2bab71277835205