Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b33403730a50c99…

MALICIOUS

PDF

86.5 KB Created: 2021-05-11 00:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1960571f56231d51fb347ca6dfe329 SHA-1: 96cf06b5ebb230188ef44b8603c349b6cf64367e SHA-256: 5b33403730a50c99d716c46869528132adf549a7da989f6b6c7a3513df5fb455
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, a technique commonly used for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the intent to redirect users to potentially harmful external sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=about+face+the+essentials+of+interaction+design
    • https://cdn.sqhk.co/ruvuwoki/hgxjdgj/privacy_messenger_private_sms_messages_call_app.pdf
    • https://cdn.sqhk.co/kopilixa/hdI3ohc/oppa_doll_game_online.pdf
    • https://cdn-cms.f-static.net/uploads/4377935/normal_6022dfc0ebe04.pdf
    • https://cdn-cms.f-static.net/uploads/4426942/normal_605594f2c7212.pdf
    • https://cdn.sqhk.co/woteruzid/gcVjaB8/lukeduribotu.pdf
    • https://cdn.sqhk.co/girasufu/WVZ6Vgi/photography_hashtags_for_instagram_2020.pdf
    • https://cdn.sqhk.co/pevotido/hjjdDdf/38064946101.pdf
    • https://cdn-cms.f-static.net/uploads/4407749/normal_600b5463df2d6.pdf
    • https://static.s123-cdn-static.com/uploads/4376369/normal_5fedd87d42b54.pdf
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/dasowegumaz-buzesaseno.pdf
    • https://jizenovu.weebly.com/uploads/1/3/4/6/134682428/zenatikedog.pdf
    • https://cdn-cms.f-static.net/uploads/4409409/normal_5fd17c57675a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_c53804db37f14d85a3fc8d6001cce89e.pdf?index=true
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_e0b9cb4884814afa8e0ff8ee829a9f2e.pdf?index=true
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_505d57dc3c26440f96317b3282ad25f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c8e7040-f267-45ba-8e7c-da01dd0f4888/pefuxeniv.pdf
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_fdf4458332824836a127ff8a417d4348.pdf?index=true
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_2be958b582b44eaebb86f0bebf802fab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0294ee6a-95ce-4b69-8bdb-ba96499f3374/dyson_dc50_parts_australia.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_off000115d6.bin
b17b50588e40d7e6d50c6898c271ab74213db2bf093fdea19f25c36781a48e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 5412 bytes
font_01_sfnt_off00012836.bin
02f9a5b8ebfcf9746c3d7df735c9a38737b9ec815192d8fd8dbe4ca92d2cbc88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 10712 bytes

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