Malicious PDF — malware analysis report

Static analysis result for SHA-256 f619c6861dde151c…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 15:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f2d70cf24903bd065d5af0d92a626a08 SHA-1: a82109deeb9f1356e697a4ac34c32ffb7ecad97e SHA-256: f619c6861dde151c8d9ac0acb79386e6cc53d8eb786e28da5a37588bb6a44842
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and exhibiting link farm characteristics, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a tactic of redirecting users to potentially harmful content.

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://xajibur.ru/123?utm_term=funny+business+answering+machine+messages PDF link annotation
    • http://helplnstagramcontact6088758.com/resistance_tube_workout_routine_printable1c92s.pdfIn PDF document text
    • http://libertinemodels.com/living_religions_10th_edition_freeatsrx.pdfIn PDF document text
    • http://reduslimitaly-official.site/android_os_for_mobile_free52orx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5ff65e34942de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5fe3477d9350e.pdfIn PDF document text
    • http://dvigatel.guru/36680465901ipp9x.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/lujagisakokufonag.pdfIn PDF document text
    • http://sberbank.services/first_cell_height_calculationr97rp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5fce58c8a1654.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/77572787566.pdfIn PDF document text
    • http://healthytrands.com/good_turtle_beach_headset_for_ps4owhan.pdfIn PDF document text
    • http://vbruti.site/ffxiv_glazenut_guiderui2v.pdfIn PDF document text
    • http://clubstore.info/60770077695y8x33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_60447171f3056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_6040309781137.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/7219ceda-d221-4416-9f78-0fbc6aa91c89/world_history_books_for_middle_school.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_a5f46f367a6e46eaaa00740f618b0f57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb14cbd-ce4e-4789-8e45-4d39f62a809b/how_to_get_into_pr_and_marketing.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/how_big_should_a_chicken_coop_be_for_3_chickens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4524cadd-fbe0-4b00-9892-a06a3eafc878/figeweperezokep.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_99c227b3d599402bafc46afa25070ae8.pdf?index=trueIn 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 5472 bytes
SHA-256: 460794f44aca51c8bcd97340f4764c31e45354262629d8289ba912965746fd0b
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 11064 bytes
SHA-256: cbb9520fe7786399b3b04ba55b365c53fa2d2f10a2bd3d0c66c8751c9cc768fa

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