Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdf9dae29ca5b81…

MALICIOUS

PDF

90.7 KB Created: 2021-04-07 14:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 953fc107a9f1af77634dda19e73699f4 SHA-1: 217eadbfdad3b6a4259d4fd333b13332974499f8 SHA-256: 0cdf9dae29ca5b81b6d401bc5eb2af89f56792b142d8a8ee1741e8014b5ea9af
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and the overall structure suggest a phishing lure disguised as a Dungeons and Dragons guide.

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://bologen.ru/strik?utm_term=dungeons+and+dragons+5e+guide PDF link annotation
    • http://guworumitikizu.iblogger.org/58781302484.pdfIn PDF document text
    • http://dfds.in/business_analytics_certification_course_in_pune61ad4.pdfIn PDF document text
    • http://svoylend.xyz/j24_spinnaker_sheet_lengtheuco3.pdfIn PDF document text
    • http://acupofjacob.com/gaming_steering_wheel_for_xbox_one_and_ps47ykb0.pdfIn PDF document text
    • http://50offshop.pro/a_world_of_art_henry_m_sayre_8th_edition_freeecd1n.pdfIn PDF document text
    • http://rutakaganutidu.22web.org/guitar_chords_tutorial_for_beginners.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/moledanap.pdfIn PDF document text
    • http://kimugifogetami.medianewsonline.com/ribalepomomen.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/jajofugaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf6dc92-2f21-41be-8eb1-0135a35eb482/62838576357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88361a45-c734-4430-8885-92dcda71b4dd/manage_projects_in_ms_teams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40557cc6-3284-4467-9d20-796aafd08901/c_object-oriented_data_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfce909f-7c49-4f88-b918-4b4cbb396788/english_textbook_class_10_cbse.pdfIn PDF document text
    • http://jupegojut.atwebpages.com/39621437000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0564b9-c301-48a3-9187-463c9753d83a/when_to_use_too_and_so.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5be16e8-badb-4742-8c16-fa5084a07521/pokajexisosuvosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb44027-3077-47f3-a84a-3c6c282bde48/32945357267.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_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 5084 bytes
SHA-256: e97bb95ce51ee315c4ee004d578cd62bb604983af79b76376d1306472b8e26eb
font_01_sfnt_off000138c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C1 10892 bytes
SHA-256: a0a11b3e5200a90049d647d4bbead4b7df3bb62f8fb3508766a5ee8142033701

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