Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbb98ae96237cb9…

MALICIOUS

PDF

79.3 KB Created: 2021-06-07 10:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f218f969676fb8490207d3403fc14e88 SHA-1: aa2d43f70d5c8a5d4fd503645b3778bb3b7899b6 SHA-256: 9cbb98ae96237cb9103632e9646fe6baebb888b4ab338513cabbf0cded35c6e4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a primary focus on the URL 'https://krisoc.ru/pbw?utm_term=what+can+you+mix+with+avocado+smoothie', which is likely used to redirect users to a phishing or malware distribution site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to obscure the true destination.

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://krisoc.ru/pbw?utm_term=what+can+you+mix+with+avocado+smoothie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402951/normal_60671d1bd5fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5fd0ea754ca7b.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/80b20640-a004-4bd9-be44-5b4e53946027/68048229614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81455f9f-1876-417a-ace4-cb769c2c35bf/guxepav.pdfIn PDF document text
    • http://taxoxuf.pbworks.com/w/file/fetch/144659835/77808003719.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/58396786975.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144611148/descargar_super_smash_flash_2_ultima_version_2019_para_pc.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/printable_color_pages_for_kindergarten.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/what_lives_in_a_swamp_ecosystem.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/are_old_figurines_worth_anything.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144443388/how_to_pair_logitech_k780_with_iphone.pdfIn PDF document text
    • http://pobonagul.pbworks.com/f/tizojasejawenakasupipidez.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144489831/mini_militia_hacked_version_download_unlimited_ammo_and_nitro.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144489639/5421581152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be32719-7ff2-4293-b4fe-896be84ddefb/muzobaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0489c3-9b51-493f-bd95-6711991002e3/marketing_management_philip_kotler_kevin_lane_keller._14th_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657ae764-335e-4442-ade0-a5cb037da3fc/gerelofejafaxosiwiwez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98dcecd-25bc-4b94-b77f-2c8023bc02d0/gosob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe36e069-e47a-49bc-8b30-ceea43c71332/do_polaroid_tablets_have_bluetooth.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_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 5388 bytes
SHA-256: 66490584c7ffbb94f8632cc05bbbbaa4b06b2502d74c3dc99f70bd02e93a6f2d
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10684 bytes
SHA-256: f2d0660eb6ec3deb3a1d1551372f7a454506a1709d56bf4540cbd3feb1542074

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