Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb31d5d75b693bca…

MALICIOUS

PDF

80.0 KB Created: 2021-03-30 17:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d721b71667495782a7ee1e9daaafabb3 SHA-1: 12e0c731ff01127a79a3f3011dc098edecc47c95 SHA-256: cb31d5d75b693bcabe53fb87a7466c730eb122122676be7514f7654a5fb8bf65
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'wildgame innovations trail cam' to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+turn+on+wildgame+innovations+trail+cam
    • https://cdn-cms.f-static.net/uploads/4444622/normal_5fd7b6431dd52.pdf
    • https://kobuwejen.weebly.com/uploads/1/3/0/8/130873730/gorali.pdf
    • http://bamefidev.mygamesonline.org/lunavegel.pdf
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/folizeva-fosaraluvuk-zigiza-sivipidologa.pdf
    • https://cdn.sqhk.co/fezavomol/hicijhe/frasier_theme_piano_sheet_music.pdf
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5fcad3502dd7e.pdf
    • https://cdn-cms.f-static.net/uploads/4418370/normal_605ffcc60c3c3.pdf
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/faletorin.pdf
    • http://gizovivomiz.getenjoyment.net/33570199049.pdf
    • https://cdn-cms.f-static.net/uploads/4367278/normal_6037d6941ccb7.pdf
    • https://cdn-cms.f-static.net/uploads/4489615/normal_600dd77b616c2.pdf
    • http://wuxixezigitezir.mygamesonline.org/25314087761.pdf
    • https://cdn.sqhk.co/jigekuragige/PVUKiiA/class_9th_cbse_social_science_book.pdf
    • https://cdn.sqhk.co/wabogojo/fL7EqPD/homeschool_subject_planner_printable.pdf
    • https://wonaxegem.weebly.com/uploads/1/3/6/0/136049801/f7f4ebfc848.pdf
    • https://cdn.sqhk.co/delopomixaba/b6aLigt/master_archer_dota_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a20e0bd2-bfa7-4f13-96de-eaf043ddfd9d/16626137368.pdf
    • http://widusop.atwebpages.com/savimimaxedaloneb.pdf
    • http://kaxuwenewutexu.myartsonline.com/am_communications_salary.pdf
    • https://uploads.strikinglycdn.com/files/165fb540-ae97-4201-9b65-0551b81c1c0b/nama_nama_asmaul_husna_arab_dan_artinya.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdbe.bin
dd4a55a317d526b353c8c3b3b4d601889723da266f741d37b5a1da7262632035		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 5372 bytes
font_01_sfnt_off00011003.bin
4f42981e4d9c9e465a38bc079b99e2ad793c3c48b551f6009ee73037a6b570f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 10044 bytes

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