Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf37c06684e4c7f…

MALICIOUS

PDF

83.2 KB Created: 2021-04-10 15:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a21e894377778213587544fc6bba6ba3 SHA-1: 3d34eaa265c6d22091e00f277a6105d71e8369d0 SHA-256: 8cf37c06684e4c7f431ddc75353d23d9c95fc6d5a5483d2b25d75f2375a4c204
184 Risk Score

Malware Insights

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

This PDF file contains embedded links designed to redirect users to malicious websites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, suggests a lure related to car troubleshooting, likely to entice clicks on the malicious links. The primary malicious URL identified is https://yafferge.ru/strik, which is part of a redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=why+won%2527t+my+2011+chevy+equinox+start In PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/674194.pdfIn PDF document text
    • https://tevomijirurefo.weebly.com/uploads/1/3/4/8/134846864/9278224.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/rhbgigj/96229573295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_602fc80dd9e96.pdfIn PDF document text
    • http://bidumowot.22web.org/filme_horizonte_perdido_1973_dublado.pdfIn PDF document text
    • https://jolosusopafo.weebly.com/uploads/1/3/4/0/134097145/kipotavafedus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_606de3108ca52.pdfIn PDF document text
    • http://rezonansmusic.com/selling_for_dummies_tom_hopkins_downloadpc7vw.pdfIn PDF document text
    • http://chaptejvxz.fun/budget_template_libreofficefzpyv.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/birekij.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/gfiihgh/free_logo_maker_app_for_ios.pdfIn PDF document text
    • http://busurman.space/45692715003vb51x.pdfIn PDF document text
    • http://sparzha.club/mumore7zhl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_6067135e9fc7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_605859ff6b8f8.pdfIn PDF document text
    • http://copyrightnotices-form.com/suririxixegabikujosaki6bxl3.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/6009860.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/QUhBAie/49428490634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_60103d5eca170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuvawewopuje.rf.gd/zuxexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3993bd25-b528-4b30-9b9d-dcd4cbfc5aa4/what_kind_of_diet_is_good_for_inflammation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e362c7-c197-4766-a273-41e2f3f966ee/sobalatafoxegun.pdfIn PDF document text
    • http://pixagikaw.epizy.com/antecedentes_de_la_investigacion_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9f5f6f-53e1-470b-9ffc-4a27b8031cf5/18931062872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2897fd2a-875e-4f92-8873-520280443b2a/41433002808.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_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 5828 bytes
SHA-256: 2911effd402e017d9d8f220f38de0b6329b7635937b4137f2b8232262bd1d4a7
font_01_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 10500 bytes
SHA-256: c4c8c91c6fb4e626a01f09e848c262b23921d0ca688a504a2808edf47688769a