Malicious PDF — malware analysis report

Static analysis result for SHA-256 d526fdaaa5b5652a…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 05:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4e045f6cbc7817ff12abc76f2970c3 SHA-1: dd7c9556691ff02b0a97dfbcc66de3388474e0e8 SHA-256: d526fdaaa5b5652a6a93a7f785cbe8ef6e84e6f0dd6754b01ebebdc8f1ffdd56
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, suggesting it's designed to redirect users to a malicious site. The document body, though heavily obfuscated, contains metadata related to PDF generation and a keyword that likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/award?keyword=jodi+ellen+beneath+this+man+pdf
    • http://buylettersonline.com/77837230741xquot.pdf
    • https://cdn.sqhk.co/repudodo/eJVig8d/84861492867.pdf
    • http://tosatosekux.22web.org/gemuzedakosemedan.pdf
    • https://cdn-cms.f-static.net/uploads/4404741/normal_60317b444f36a.pdf
    • https://cdn.sqhk.co/kewukapugino/djd0MkB/wezun.pdf
    • https://cdn-cms.f-static.net/uploads/4424982/normal_604cb944c8836.pdf
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5fc77a8b26a34.pdf
    • https://cdn.sqhk.co/rufadexu/iajdE0k/battle_royale_coloring_books.pdf
    • https://cdn-cms.f-static.net/uploads/4490739/normal_5fd79aae88080.pdf
    • https://cdn-cms.f-static.net/uploads/4459470/normal_603f577b123dc.pdf
    • https://cdn.sqhk.co/tuzukada/7Lhciv3/css_stylesheet_in_jsp.pdf
    • http://cenderaoriginator.com/vugowavovugoj5ikg.pdf
    • https://cdn.sqhk.co/vutexexukus/HahgFic/81567011217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/725ec3b3-0d98-4444-aa5d-ee3c2aeb50c3/tokomus.pdf
    • https://s3.amazonaws.com/rebomedug/naxex.pdf
    • https://s3.amazonaws.com/fixararololu/46897698514.pdf
    • https://uploads.strikinglycdn.com/files/d1f2a7bd-aac4-44c7-8f75-4ae2cba1b213/62495769990.pdf
    • https://s3.amazonaws.com/pusolefosex/ridifolibutiforogero.pdf
    • http://jazomavok.epizy.com/line_6_hx_stomp_vs_headrush_gigboard.pdf
    • http://lelisavebak.rf.gd/how_to_fix_a_kenmore_elite_ice_maker.pdf
    • https://uploads.strikinglycdn.com/files/bc3247bd-b9e7-45fb-b8a0-7714cffedcf5/english_marathi_daily_words.pdf
    • https://uploads.strikinglycdn.com/files/434d68d2-f605-4297-9071-ea665f8d4888/2736572788.pdf
    • https://s3.amazonaws.com/zamuriza/98587769795.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5bb.bin
13f75edd85892a998c3c10d66250aa2e95f9970831547f3a39b8200c2fd19072		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 5312 bytes
font_01_sfnt_off000107a0.bin
ac7d53cc7ee7491eba0a068ec43f942c80de6da17c918609fbeafcbbb1de6ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 12240 bytes

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