Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f106781722641b1…

MALICIOUS

PDF

73.0 KB Created: 2021-02-27 21:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4f4d728695eec055d3e082cffb8fb542 SHA-1: 86c37e638fd06c7a45369398bd9425c292683b0d SHA-256: 5f106781722641b187da44fbd1ddd3667272645228d6e3404012bfc36a7d42db
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The primary URL, 'https://xezojetit.ru/strik?utm_term=how+much+should+it+cost+to+replace+a+windshield', indicates a lure related to windshield replacement costs. Heuristics and ClamAV detection confirm this as a malicious PDF, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=how+much+should+it+cost+to+replace+a+windshield PDF link annotation
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/tasugitelusel-tozexul-zebatelukoneg.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/raxaxerokuwuboxutur.pdfIn PDF document text
    • http://bexodasavuf.22web.org/source_2_free.pdfIn PDF document text
    • http://lilisejujope.iblogger.org/84385919736.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/safety_not_guaranteed_rotten_tomatoes.pdfIn PDF document text
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/gakitud.pdfIn PDF document text
    • http://afracheat1.xyz/faforinumuguzoxezx1ewq.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/e70eea54.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/magnetic_mini_portable_car_gps_tracker.pdfIn PDF document text
    • http://wersita.space/principios_de_auditoriasjki8.pdfIn PDF document text
    • https://kogekotosejikol.weebly.com/uploads/1/3/5/4/135400664/samojoxopisokep.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/preposition_activities_for_grade_5.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/the_righteous_mind_bahasa_indonesia.pdfIn PDF document text
    • http://sreview.online/dabumedomukadukedeiwtpm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/11285635707.pdfIn PDF document text
    • http://dudulexo.epizy.com/2013_chevy_cruze_ltz_owners_manual.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_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 5368 bytes
SHA-256: a9bf3eefd320b9f6e65c0e99a0eeed4c6b2e42f549ab6ae39b0f65863c1f0abc
font_01_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10792 bytes
SHA-256: e571227a1e4115f05de2f5f19a399507693fda4ff8ec72ea8d7d8ace13e44a07

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