Malicious PDF — malware analysis report

Static analysis result for SHA-256 8509f62d31e3af91…

MALICIOUS

PDF

83.8 KB Created: 2021-03-15 13:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d2b9abc22b0ed17972cf980fd1a1f03d SHA-1: e2092ab0815c41f2a6f93f0651d4f6d46eb21586 SHA-256: 8509f62d31e3af9121b7f84100122458d668cd61c690cdc673f3708042bdf3cb
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 0.9990

Heuristics 5

  • 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 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://soxebez.ru/123?utm_term=hot+cross+buns+beginner+piano+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60210be422fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fdbec5726abd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_5fe252ed2f57c.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/xemojogivebisig.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/woxesozu.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/what_are_enfps_good_at.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_60166de52cc29.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/sitexodomekididuwin.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
    • https://uploads.strikinglycdn.com/files/886561dc-8034-4010-afd5-e103a761c193/nuvata.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/38106277363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3694c59-3992-4c0d-8b06-374ead2e6190/vofulufiku.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/panasonic_tc-p42x3x_no_enciende.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afecc58-3513-4964-ae4a-49a3b61b7f92/sex_offender_registry_va_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433878b7-4138-4d20-aca4-82923b07866e/the_argonauts_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1beee93-e060-4ea3-b4b5-0a2890ad7fe9/stealth_cam_menu_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d6b479-a0c5-4e43-8958-36f6c88872e3/fiddler_on_the_roof_new_broadway_cast_recording.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e97d943-665e-4ec6-a77f-62320ed9d6ad/pifasegevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5143fd8b-9303-49cf-807f-a72ea04812be/the_outsider_synopsis_episode_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/royal_challengers_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84327a39-3317-4e45-9ba0-08bcf1f9dafc/what_is_a_managerial_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f97cd2-7c28-4f40-af72-c58268a981f7/eheim_everyday_fish_feeder_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/how_to_use_adobe_acrobat_pro_dc_to_edit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadee219-7edf-4392-bbdd-8211ea8077a8/82137785239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe8889d-643f-43bc-bcba-482187948db3/tikewopezuduwafejipoda.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_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 5300 bytes
SHA-256: f333d58e28e942bbf12ba4c11ab5d1b947e51b4ef426ef4cec2703642348eace
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 11036 bytes
SHA-256: 37f3ea73bf279f975e60dcbee3adc698745bd0c018a3ea35847b4b650f40d295
font_02_sfnt_off00013390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13390 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3