Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edf0bb1dfbb0f71…

MALICIOUS

PDF

100.9 KB Created: 2021-03-13 18:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06d9511fdb8e77ccd22f22f2f2297df SHA-1: d9b5632e2528cced892713550c6d79d24dccfc1b SHA-256: 8edf0bb1dfbb0f71462163ae129a18749502b14bb16dc7c9e61a3163d4ce7c65
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to reference a technical book title, likely as a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://jacksth.ru/strik?utm_term=stallings+-+computer+organization+and+architecture+designing+for+performance+10th+ed+2016
    • http://vakiduweg.mygamesonline.org/71337450861.pdf
    • http://jojidasusesot.sportsontheweb.net/henri_lefebvre_the_production_of_space_citation.pdf
    • https://cdn-cms.f-static.net/uploads/4370080/normal_602676fbd5b4e.pdf
    • https://cdn-cms.f-static.net/uploads/4368760/normal_601e37c73a531.pdf
    • http://juraxoxodas.scienceontheweb.net/how_to_change_my_lg_tv_from_black_and_white_to_color.pdf
    • http://mapotilij.mygamesonline.org/31842326902.pdf
    • http://bexemusu.mypressonline.com/sindh_anti_corruption_act_1991.pdf
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5fcf811c9c48f.pdf
    • http://niwizonoleror.mywebcommunity.org/free_weekly_safety_topics_construction.pdf
    • http://lorakuze.sportsontheweb.net/40073227020.pdf
    • http://xasowokudat.medianewsonline.com/36804985059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuwotatikiluwa.epizy.com/chicken_invaders_5_full_free.pdf
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_7d4695e088504be88eb8d2fc8a2c41c7.pdf?index=true
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_f190db89b8254aa189615680bad7d2a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/542fa6bc-282e-4374-9169-afc80f71d62c/bekabopezikamoriwujexen.pdf
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_8c23ccb526e14f309bf61dc3eaf23a4e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4a02077-8dca-404f-9243-35cb797f4e1c/casio_f_91w_12_hour_mode.pdf
    • http://samajusinifako.atwebpages.com/48966554361.pdf
    • http://kamegil.epizy.com/32493046713.pdf
    • https://uploads.strikinglycdn.com/files/b51e79a1-f333-4b8c-ae99-8b8d434f4d66/kaba_simplex_lock_instructions.pdf
    • http://pusebirenox.myartsonline.com/40270636384.pdf
    • https://uploads.strikinglycdn.com/files/d639f96d-2cd7-4eec-8190-c8ec4d059712/netgear_powerline_1200_ethernet_not_working.pdf
    • https://uploads.strikinglycdn.com/files/f97caca7-6da1-49b0-93e7-60a170569498/bevajofasiluwuso.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_off0001487e.bin
ff55383076ec026d8a04b37a78f70051b54f4b27df946e3f44eb4ecb70cc5c38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1487E 6232 bytes
font_01_sfnt_off00015d9a.bin
62990de468c1ee88a2694ea3d0f13efb6718d8d085495e617ab5e2f75a9d3030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9A 11332 bytes

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