Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe3ad4f68504a84…

MALICIOUS

PDF

71.3 KB Created: 2021-04-07 23:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: da0fbff5c6ed3cec2abb915c408249c2 SHA-1: c3dc0f957db125541e53881932b90ea33b727306 SHA-256: cbe3ad4f68504a843998ec5c2940f555f2e310fb4f00b6bb75c5a3d99af78555
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicative of a link farm. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this behavior. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://lozipotod.ru/wix?keyword=xds+9mm+guide+rod+laser PDF link annotation
    • https://cdn.sqhk.co/gixelotopa/alm7nje/31360692084.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/S9hgHUE/zejujuvujanap.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/Qtiasv1/36018703902.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/CjhRkJ1/duvunolazanijovezepozuw.pdfIn PDF document text
    • https://lezigumaluneluw.weebly.com/uploads/1/3/1/4/131454696/pidujopire.pdfIn PDF document text
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/6427893.pdfIn PDF document text
    • https://rimibike.weebly.com/uploads/1/3/4/6/134636102/vugejidaso-fumidi-tefekaw.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/iil97g8/kabugokawutonowi.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/0mNibt5/xuwapinebadunadilirubu.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/gHheifb/fovezotajapifafigeboj.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/hdPjahg/ca_dmv_appointments_coronavirus.pdfIn PDF document text
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/8619850.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/117065ea.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/Ii3iiic/indycar_iracing_challenge_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/gL8Vunu/ants_in_house_remedy.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://rodegap.rf.gd/analisis_bromatologico.pdfIn PDF document text
    • http://jopewadakos.epizy.com/jar_of_hearts_sheet_music_free.pdfIn PDF document text
    • http://sujosoxajixojiz.epizy.com/buku_siswa_agama_islam_kelas_10.pdfIn PDF document text
    • http://sujomux.rf.gd/analysis_of_algorithms_robert_sedgewick.pdfIn PDF document text
    • http://fakodesugi.epizy.com/neoplasia_intraepitelial_cervical_grado_3.pdfIn PDF document text
    • http://lunujebof.rf.gd/35267694718.pdfIn PDF document text
    • http://guwopide.rf.gd/57751137044.pdfIn PDF document text
    • http://zanavaf.epizy.com/engineering_physics_books_for_1st_year.pdfIn PDF document text
    • http://nitiparavedo.epizy.com/mexusegusepiripobodi.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_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 4972 bytes
SHA-256: 07c164702bcd0e71bdba07068ca7936cbd6e322cc9ca331cc53cb39f42e9a0f8
font_01_sfnt_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 10160 bytes
SHA-256: b2348fd8fab50bf3e770cd880c3545f019d86bda4b2283b26508cfbd6faf30e1
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3