Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa59fe433ade5ff3…

MALICIOUS

PDF

93.3 KB Created: 2021-03-05 21:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 15dd020308626411a7b724cd68b7c859 SHA-1: de6f865f2c982493dcac81877f2fe5a0571b780c SHA-256: aa59fe433ade5ff316fb5eae9f8746163c99f5c1e5a3e2159eb720ec7ea39868
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious or deceptive content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and detection signatures strongly suggest a phishing or malware distribution attempt.

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://gimoguvi.ru/123?utm_term=maven+repository+tutorialspoint PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5fef4eb0a7a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_6041c8e2a2dec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_600306b4d3f50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404107/normal_5fe2961d47b60.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/texarozudidaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_600c1568d37a8.pdfIn PDF document text
    • https://wubedekajonew.weebly.com/uploads/1/3/1/3/131380741/6d3342e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_602dc8d8e941a.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/9375281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/assassin_s_creed_odyssey_pc_settings_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091f3681-adf7-4b75-a3a7-3ee77fa98f03/the_bet_short_story_character_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7ee5c1-27ca-4ec3-8541-0ec38aed7d3b/how_to_download_gta_5_police_mod_on_ps4.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_45bd53b784d14330a2f90b11ad156070.pdf?index=trueIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_9467276b62dd46ff8ee5d9a9d889f239.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/33755633946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ec6041-60d4-4c0e-b900-8f06504ab81f/76786520146.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_e99749011bb8411aac68ce2bc212a3e1.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_3d35227b8383453f932522a8e44b3103.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/online_report_chughtai_lab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109b2d83-63fc-4699-86d5-5da22c4a317b/tujirunofi.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_off0001308c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 4980 bytes
SHA-256: 9778c92add0844df733ffb4cb3d19faf095d804415c1a296441d7ac2517cd1ea
font_01_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 11300 bytes
SHA-256: 17acce3cfe191ca74530b2a8af923688dd536159c38030f9c773d574ce3b2822

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