Malicious PDF — malware analysis report

Static analysis result for SHA-256 f849e2564cfde29c…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 09:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c913b26e98e47e0070c35df27f28848b SHA-1: 926ae591c6969a0f9bb6eb93f6555d13890e65d5 SHA-256: f849e2564cfde29c36991b1249d430cdd22d242ad29a30adcba86ae8a0163118
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to redirect users to potentially malicious sites, such as the one found at vilenefex.ru. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, reinforcing the idea that the primary purpose is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://vilenefex.ru/award?keyword=iti+engineering+drawing+paper+pdf PDF link annotation
    • http://fapadobitazi.22web.org/70838287806.pdfIn PDF document text
    • http://wuzagabi.22web.org/probation_review_template_uk.pdfIn PDF document text
    • http://thedouche.xyz/85357545310m0525.pdfIn PDF document text
    • http://gadifurewurol.22web.org/math_formula_class_8.pdfIn PDF document text
    • http://xisajole.iblogger.org/what_are_the_8_types_of_text_structures.pdfIn PDF document text
    • http://sununetapa.22web.org/donkey_kong_pill_report.pdfIn PDF document text
    • http://icub.tech/identifying_isotopes_worksheet_answer_keyby6k1.pdfIn PDF document text
    • http://livecopyrightverification.com/refikafezapd9cz.pdfIn PDF document text
    • http://teleporttur.ru/67306209368pxkxw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://buluperase.epizy.com/73745865381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3bbe67d-1716-476c-8785-fe41ef6882d0/lulikozobezenanilosorigox.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_eaacc6becec145b7834d9afef6f49c1f.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_2a85b9f5f59449768449bed484aca69d.pdf?index=trueIn PDF document text
    • http://lipaxunuvevi.epizy.com/28892459093.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_ed35f11cb5924a84a7b75ff5422dded7.pdf?index=trueIn PDF document text
    • http://madekubadasa.rf.gd/jenakitanipijidupubolika.pdfIn PDF document text
    • http://denuvadejo.rf.gd/escape_plan_tamil_dubbed_hd_free.pdfIn PDF document text
    • http://gizugutopaf.epizy.com/biology_notes_for_class_11_chapter_1.pdfIn PDF document text
    • http://dopomiw.rf.gd/46489845715.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_815bd25f61284749b80da3d730ddecea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/067e6bdc-9d6e-4402-a43c-a9990cc5bb75/club_c_cardi_sneakers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9658d7eb-f513-4948-8a05-64b0063d5fc6/roland_td-11kv-s_v-compact_series_electronic_drum_kit.pdfIn PDF document text
    • http://tetozidix.rf.gd/mental_maths_grade_6_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca543e4-71d5-40f7-a8c0-be78ec3ae07d/how_to_reboot_an_old_kindle.pdfIn PDF document text
    • http://vesunak.rf.gd/niziwopifekivukadiwagowet.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 5028 bytes
SHA-256: 049a146383da66f617f85aef4243f7d1a29e3f8d04a4842849a66378d3799226
font_01_sfnt_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 10552 bytes
SHA-256: 9fb6f41c89807d642c8be685852b010113499fa55f9c7c6303b1dd82bb6a1d54
font_03_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 10464 bytes
SHA-256: add3e412ab4e0c2ec6c1e8487d492ba1b2d720d6b6a703931de506b6fe730a2b