Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ecf2e30f45270a…

MALICIOUS

PDF

78.7 KB Created: 2021-05-11 15:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: eb5935e235c406949cc373cff751259a SHA-1: 46ab4f562035bf419fd5937e08c04726d7c8f074 SHA-256: 31ecf2e30f45270acb49656d3e21b3b7310c177ce26d652eac8652a1e2665441
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a link farm, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain search-related terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=quran+english+translation+audio+download PDF link annotation
    • https://cdn.sqhk.co/dupeguwova/ifHkvPp/ninjas_infinity_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/aigiaRF/dune_book_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/YichaPD/roller_ball_lip_balm.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/ngfv4oM/samsung_members_apk_sammobile.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/iblgccG/fokiwubunuluminelixa.pdfIn PDF document text
    • http://mkr-olimp.info/83884909311ooyao.pdfIn PDF document text
    • http://zoomita.space/two_way_radio_headsets_for_saleyn02i.pdfIn PDF document text
    • https://wejuwano.weebly.com/uploads/1/3/1/1/131163718/813059c5f.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/TRjgcYH/louisville_farm_show_2020_dates.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/ximejuzafesetuvojof.pdfIn PDF document text
    • http://forsage.pw/azamara_club_cruises_headquarters_phone_numberaoino.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/KgeT2pe/90674261718.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/e04340bb.pdfIn PDF document text
    • https://raponomipa.weebly.com/uploads/1/3/2/6/132681826/nuvabo-zapobanipi-gadegonimu-bikirekojeva.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/7138206.pdfIn PDF document text
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/9d0375f.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/d252902a-71f5-4742-93da-ceca7f607109/vezolosexifijanolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d648b3db-22ca-4b51-a5df-f4c05d24d50f/the_wahls_protocol_cooking_for_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a44479d-3246-4003-b9c8-5c513e8b16b8/nifidivelawowunovipivepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c590c61f-4e3b-424d-b81f-c4445f138166/what_things_are_illegal_in_dubai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83d4cca-bfbb-44fc-a052-58a07bda7689/bokubikoxejufivavopebabe.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_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 5240 bytes
SHA-256: 22589d8b07a1abcb38158f338117f8d21d1d5d1bd50a7425012ff7d5c74bae2b
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 10644 bytes
SHA-256: d9dd947e4974b30f87659e3fd5db60b060a20c74c6689d66153fa730b65f83f5

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