Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5971edcdb43dea3…

MALICIOUS

PDF

75.8 KB Created: 2021-04-06 17:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 926e4ad9e108678aa5d29f71b46a41f3 SHA-1: 9f76be65c6cbf43fd8595595ce48716df9b2d687 SHA-256: a5971edcdb43dea321669c3232ec9dfb14895559830f2ff441b99a888868eb42
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to redirect users to potentially malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wix?keyword=my+anchor+general+policy PDF link annotation
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/fafubuwif-lepobizojeb-fexixepe.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/8015053.pdfIn PDF document text
    • http://difuraw.22web.org/cedar_rapids_kernels_schedule.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/kegewegi.pdfIn PDF document text
    • https://cdn.sqhk.co/goxejake/ge1xmii/shark_old_rs.pdfIn PDF document text
    • http://piluxawuxawo.22web.org/drawing_human_body_in_perspective.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/k3VeYge/e-_wallet_app_means.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/HKiahgL/cossacks_motorcycle_club_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/HgdPjh2/di_moda_salon_columbus_ohio.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/UmN1Kge/my_lottery_dream_home_host_face_tattoos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijorud.epizy.com/beowulf_a_new_verse_translation_bilingual_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a158ba8-0792-400a-8547-fa5b034d6bd6/janidunirokowokik.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/59748153033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa323a7-c6f3-474d-ad6b-3e9c2a2d8c1f/25392146036.pdfIn PDF document text
    • http://libizutuxe.rf.gd/ielts_listening_recent_actual_test_vol_4.pdfIn PDF document text
    • http://nosekaj.epizy.com/20361137983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af580ea8-41ab-43df-8319-232a1e0a15e3/pensar_rapido_pensar_despacio_opiniones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d5a2c6-6988-47e0-9388-f4746898bd12/sijepoposuzosije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6054902-fd4f-482f-8a50-a059d5f47966/mevasukajifidiki.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/que_es_un_titulo_de_tercer_nivel.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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 5124 bytes
SHA-256: 5145af43e11dd5f3055ea26c92681930468e50f137b9e83562560f681413324f
font_01_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 10656 bytes
SHA-256: 5315e57c47a5dff06d732254467066ee4ed7a9964117a8211fe3e4b3c93cb360

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