Malicious PDF — malware analysis report

Static analysis result for SHA-256 a383d3717f0627f3…

MALICIOUS

PDF

75.1 KB Created: 2021-06-07 00:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a83fc4af5d7e54c89b4a478edd301ba8 SHA-1: 1f3a5faa097088815e002b4fa92fa15712e531dc SHA-256: a383d3717f0627f308aea20dde1735ece0712f3bfcba858fd0c0915698f6de58
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high concentration of them pointing to disposable hosting and redirectors, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/pbw?utm_term=ias+38+intangible+assets+full+text PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482402/normal_5ffcc7c538c1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_604e0a82c6690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fd2721718832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_60418e4131c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_60164b7b11ec6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekipirunezi.pbworks.com/f/junior_software_developer_technical_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93799011-02c4-493a-9e77-c860988f7c3a/best_ratchet_style_belt.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/w/file/fetch/144738744/followers_and_likes_tracker_for_instagram_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fc683f-1bce-413c-8545-3eeb256ea1ea/potekexele.pdfIn PDF document text
    • http://gaguseka.pbworks.com/f/16273966517.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/disney_plus_price_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ae2e34-3cb1-47ca-bfa5-34232f91c0d0/daxagulededewefodobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31864f3-d636-46ec-9758-67be72b14a43/how_did_kamala_khan_get_her_powers.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/94629216699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5973415-d2fc-4a38-95bd-72ac4b22a6c6/5702265827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9add90-c80c-4121-94c3-c6b7b54668c5/15128805397.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144590559/tijimebulekaxegixe.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144504627/tulipirivizorir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481f8b64-8dd6-425b-b58e-62321c6ed98f/jorge_luis_borges_biografia_resumen.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144420576/toddler_cape_coat_pattern.pdfIn PDF document text
    • http://zeranagaro.pbworks.com/f/antrenmanlarla_geometri_1_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019c4002-854e-4242-8d57-a8638e19c72f/sigoxilemipebenijanozamu.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/w/file/fetch/144672993/14508542735.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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 5340 bytes
SHA-256: ca65bbfe3060b4b537a8c887d7a99ec880060458168191ecbb8f7d66f6a83c0e
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 10148 bytes
SHA-256: 8ab104f5d0410d04646adf0b117723728c00c8d82ab7eace3df71d13473517c3