Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd46c1e88a6507bd…

MALICIOUS

PDF

88.1 KB Created: 2021-03-13 21:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ab1eae8fbbbd22dd37d138057469076 SHA-1: 5fc286d9a8f069f9f6734aaefa6ee5042a725286 SHA-256: fd46c1e88a6507bd31ae9c82053d60096298550c073ef9c97f44f92bd2187e95
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://pelibifir.ru/123?utm_term=broiler+production+zimbabwe+pdf PDF link annotation
    • http://kirudikegopoded.sportsontheweb.net/rojano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_5fe7a15c5def8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6018a5ff6e54e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_6034389f1fead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6020f8e071728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_600574d710b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fe986a90434b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_6035ae68689b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387932/normal_5fc753b59dee4.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/amazon_lord_of_the_rings_casting_call.pdfIn PDF document text
    • http://woxuvuxu.iblogger.org/sbi_clerk_exam_solved_question_papers_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_604cf75b63a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_600bafad46434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_6029c46bb53ba.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/26576874226.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/anticipations_rationnelles_et_adaptatives.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_6047c8d5076eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nosevutomos.rf.gd/ipad_app_answer_phone_calls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb33b5f-c148-461c-a6dd-d4b5ca471221/honda_civic_coupe_2006_front_bumper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb1930c-72cd-425c-abca-e8ce6bbfd80f/microsoft_visual_basic_for_applications_window_excel_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f65c622-3d85-4400-a338-112edb9a30ff/what_video_formats_does_premiere_pro_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b316d85-60dd-4945-bc51-303f83bec0b2/how_to_become_a_real_kid_spy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939b0898-3302-471d-afaf-ac376425e970/chess_tactics_puzzles_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 5336 bytes
SHA-256: 15505fe74ac6c5027d9378500ca437fcaee8d050468a9e93bd1e6beaac48dec4
font_01_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 14712 bytes
SHA-256: e18c8247421eb071a4828153b29abe623a2618bfe628dfaea89114babfc3b338
font_02_sfnt_off00014374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14374 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361