Malicious PDF — malware analysis report

Static analysis result for SHA-256 950165fd53f85457…

MALICIOUS

PDF

72.8 KB Created: 2021-02-16 22:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3df590323fbcce67ae9de2bd0ad32d05 SHA-1: 28ae78377263588e43d584dd01d06d094444bef5 SHA-256: 950165fd53f85457d308dc2dbb4f683c40abef491667e6b94417821b75c90eef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external, often disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

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://druttle.ru/aws?utm_term=how+to+connect+rocketfish+bluetooth+music+receiver PDF link annotation
    • https://cdn.sqhk.co/xelalizogim/iCicxxV/vokulek.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/ghVugee/block_strike_for_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_60135fb86a739.pdfIn PDF document text
    • http://g2am2e.xyz/3319819544665cch.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/z2ihjqK/ninjago_vs_ninjago_masters_of_spinjitzu.pdfIn PDF document text
    • http://wegansit.space/wozedekptc.pdfIn PDF document text
    • http://rocketdocs.us/pfolio_photos_gallery_and_slideshowsgq930.pdfIn PDF document text
    • http://mazers.fun/the_dictator_cast_borat4ubw6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5ff56ca9c6c2b.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/XAShbhf/66851912244.pdfIn PDF document text
    • http://123dutch.com/gakisusapixusitanogowjejhz.pdfIn PDF document text
    • http://kukushpa.fun/xafojiregudamafiretavomaye86.pdfIn PDF document text
    • http://instasurprise.online/making_letterhead_template_in_wordkpx6w.pdfIn PDF document text
    • http://price-list.moscow/android_oyun_club_real_car_parking_2_multiplayerp3h1j.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/vjjheij/64633654625.pdfIn PDF document text
    • http://manybigs.space/9419674263944trk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 5228 bytes
SHA-256: 76bacd49e3d8a25adffc344657c10243db120b3197c19598e63a02b0ca8bdfc1
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 11352 bytes
SHA-256: 2a5add9c8fae5f86b6ccf7e0aae780ffa9e103545eeb56a532fc618edd34e1ac

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