Malicious PDF — malware analysis report

Static analysis result for SHA-256 b665975f1098ab1c…

MALICIOUS

PDF

110.8 KB Created: 2021-05-21 03:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f24a231f748b18e75a2c0417c43c1cc SHA-1: 1798ee9ed1531acc2e67d270b3f779ff88ff59ac SHA-256: b665975f1098ab1c1680c3017a716f3e667cfeee43934dbc76324d4d2ab3089d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one URL flagged as malicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/strik?utm_term=dirty+boyz+art+of+storytelling
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/dc25b.pdf
    • https://static.s123-cdn-static.com/uploads/4374203/normal_5ff1b72f2ff86.pdf
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/1558966.pdf
    • https://cdn-cms.f-static.net/uploads/4379482/normal_600d8e21ae23b.pdf
    • https://cdn-cms.f-static.net/uploads/4375515/normal_601a47a387add.pdf
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/nirilurigivozi.pdf
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5fe754e46ecbc.pdf
    • https://cdn-cms.f-static.net/uploads/4370076/normal_6042fd43e7fa6.pdf
    • https://static.s123-cdn-static.com/uploads/4416798/normal_5fca03b7688a9.pdf
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/batiwefuwemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a308b8a5-49a8-461a-9e5a-c3008a6570fb/96064517248.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/engineering_graphics_important_questions_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/60f179ac-cc0b-41c2-b163-7f26eb42ccaa/porsche_cayman_maintenance_costs.pdf
    • https://uploads.strikinglycdn.com/files/df1ccd1f-9c2a-4549-a268-9ddd827fe220/firiperod.pdf
    • https://s3.amazonaws.com/xelimewat/how_do_i_reprogram_my_autostart_remote_starter.pdf
    • https://s3.amazonaws.com/metakibeme/17379896950.pdf
    • https://uploads.strikinglycdn.com/files/0cae8350-32b3-4b2a-aa8c-fc99a82f7eb1/autocad_free_trial_online.pdf
    • https://uploads.strikinglycdn.com/files/d2c0a08c-1ae5-4329-9bee-547a432c089a/read_sherlock_holmes_online_free.pdf
    • https://uploads.strikinglycdn.com/files/a06d5087-0b89-4bcd-9c90-747d73269f70/disezavana.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_off000172dc.bin
22505be895839ce3b975f175b7f4b6164fddd59b061d7f7cc74eda394225bcfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172DC 5224 bytes
font_01_sfnt_off000184d0.bin
158cf8c82cc64af89bc529e3831bf43b09c9867195c191ff04011f6368d676b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x184D0 11696 bytes

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