Malicious PDF — malware analysis report

Static analysis result for SHA-256 0579b81e0445958d…

MALICIOUS

PDF

75.6 KB Created: 2021-04-28 06:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4f425566213546c6b8f771b507e423fb SHA-1: 933bb8332be5f0ea25a2617af9a44d7d28a263ee SHA-256: 0579b81e0445958d823c9598fb90fadcd9b1949161c5bc36d93ec7432328925e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains that are likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a product review, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=logitech+k360+review PDF link annotation
    • http://nirenodeba.medianewsonline.com/69824839447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_602452f3b2e02.pdfIn PDF document text
    • https://fujolununepa.weebly.com/uploads/1/3/4/6/134683680/zinekavul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_6020d17318f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_6069e278152e1.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/95e8ba1f12e1ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493579/normal_6031cb9474521.pdfIn PDF document text
    • http://doburepos.iblogger.org/22730283730.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/moore_s_clinical_anatomy_8th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471686/normal_606132c76e615.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/1034078.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/7e970e76.pdfIn PDF document text
    • https://gavurudujugewi.weebly.com/uploads/1/3/4/3/134361378/6889944.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurunuj.epizy.com/totazinuni.pdfIn PDF document text
    • http://zenadeguposu.rf.gd/ab_workout_plan_for_females.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/35354631340.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/what_is_catching_fire_book_about.pdfIn PDF document text
    • http://bosefijov.epizy.com/gijaxopasedebiwebes.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/vocalise_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b536029-fc3f-45ae-b448-0ccab77de7b5/how_to_program_ge_heavy_duty_timer_with_astro.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/14819637553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4672aa3-1888-4705-a52d-8ef2a1b01225/how_multiply_2_columns_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a96c230-57f3-48d2-a466-d9e998010766/gefimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6465beba-f907-41e7-86af-3ec4be7c5850/fenaximarexa.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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 5260 bytes
SHA-256: 9a9b7703da3c506d46b96e9139a7565c0c98ccd20e06f3fb2da264a9f2aa992a
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 11100 bytes
SHA-256: 065dfd749d6a3fbbc33209f821d06844750278dbadbdca5514fc65b48541ca97

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