Malicious PDF — malware analysis report

Static analysis result for SHA-256 e492501cae211b87…

MALICIOUS

PDF

88.1 KB Created: 2021-03-16 23:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85ec0c79bc6ac9bbe82b2adec7b72640 SHA-1: 76d164209a1603d66af8d8fe7b5d883608fdbdf9 SHA-256: e492501cae211b87ebf4fe81e0768c4ed485b6179dc74157b854b3072ad9b47c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially a phishing or trojan delivery mechanism. It contains numerous external links, with one prominent link pointing to a URL that appears to be part of a link farm designed to generate traffic or distribute malware. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=pillowman+full+pdf
    • http://wodedutipif.medianewsonline.com/african_traditional_religion_and_christianity.pdf
    • https://cdn.sqhk.co/wanolugago/ic5jehh/348219012.pdf
    • https://cdn.sqhk.co/kugefaxeker/gejmJQZ/saduwibefezagosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fixidil.atwebpages.com/ethics_theory_and_contemporary_issues_9th_edition_quizlet.pdf
    • https://uploads.strikinglycdn.com/files/cf1b76e2-5314-48a8-9fa5-22991aab8d68/cuntos_milmetros_cbicos_hay_en_un_decmetro_cbico.pdf
    • http://famomijis.onlinewebshop.net/anti_corruption_law.pdf
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_2421c0ef7a3545788fe72bd27fec979b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4180d7d-9ceb-4f3b-bbaf-d89ba12232fe/hamlet_act_1_scene_2_soliloquy_significance.pdf
    • https://uploads.strikinglycdn.com/files/c80584ec-fd33-426a-9f0d-591a53eb9c94/zalotopotowurafuduf.pdf
    • https://s3.amazonaws.com/satulibaren/50225814688.pdf
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_f60acba7be9a437d9d111f94588fca8b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/baa16227-8d8b-442b-a11d-c65683243773/87575680092.pdf
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_451e3a817cc84f20ac49c4d9a62ec3fc.pdf?index=true
    • https://s3.amazonaws.com/lumixi/barrow_county_detention_center_inmate_information.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_6c035b87dd564310978aa8b0dd31f426.pdf?index=true
    • https://s3.amazonaws.com/rizoli/titan_440_epic_parts.pdf
    • https://s3.amazonaws.com/tosego/tatavetizago.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cdb.bin
084e039ee9b40a5454899a984eded28d3a25dd6cd7c64b44a5076e2e670c0dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 4116 bytes
font_01_sfnt_off00011b6b.bin
e9b981f2555a1b004673aca27f2164e09ba99b7e3d88689b31e5edd4c297c134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 5004 bytes
font_02_sfnt_off00012c78.bin
6ffb4f491ebfc8cf36b49a6709e8564d663b7b8607c31564c6e17282d834a8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 12776 bytes

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