Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2d98404fb73e45…

MALICIOUS

PDF

73.6 KB Created: 2021-03-22 23:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9dc6ad3d6d22ed032e3cb23cb0e9d1c SHA-1: 18f750e59e02a5ef3160b8570a194e6bc3d098ba SHA-256: 0e2d98404fb73e459506f36051bfa1819fd34665949c3e278fcfbe79b1b3491d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for SEO manipulation. The primary suspicious URL, 'https://kuzutuzo.ru/award?keyword=adda247+books+pdf+free+download', suggests a lure for users searching for specific book downloads, likely to redirect them to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kuzutuzo.ru/award?keyword=adda247+books+pdf+free+download
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/zosavofitigunojedep.pdf
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/6199805.pdf
    • http://dujalubudekir.22web.org/english_conversation_book_online.pdf
    • http://desokore.medianewsonline.com/gumagimuloxulimiluser.pdf
    • https://nakenofol.weebly.com/uploads/1/3/0/8/130814118/8a39a.pdf
    • https://cdn-cms.f-static.net/uploads/4445104/normal_60146a1a3e45c.pdf
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/8127105.pdf
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5fe6be4b550c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f6b1290-37d0-4b2a-a01f-5ce7d7b581ac/26512428392.pdf
    • https://s3.amazonaws.com/lefemijip/xalupemiroz.pdf
    • https://uploads.strikinglycdn.com/files/17905f3e-80ce-4a99-a039-2d0283b715ce/hp_z420_power_supply_pinout.pdf
    • https://s3.amazonaws.com/wovisak/malwarebytes_anti-_malware_pour_android.pdf
    • https://uploads.strikinglycdn.com/files/d507caf9-a71b-43b6-a13d-c593d1939812/spark_definitive_guide_databricks.pdf
    • http://waboxizolomove.rf.gd/nokia_atf_box_setup_free.pdf
    • https://uploads.strikinglycdn.com/files/fe3f99c6-7504-4207-b97a-1d65dd13b116/13247862839.pdf
    • http://furunes.onlinewebshop.net/automated_guided_vehicle_systems_a_primer_with_practical_applications.pdf
    • https://s3.amazonaws.com/wezukep/bardo_thodol_italiano.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_off0000e079.bin
d224c2c5f854302c9d4938524d80a0c0bad510a16c1c97904fbd75c445a404e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 5620 bytes
font_01_sfnt_off0000f3c2.bin
3d0b7ac3c2a249345cdc34044ab204fad231c1290999c1ab4158765002a46980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 11052 bytes

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