Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bda1468349735a3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-11 06:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b05fb60b36d8193d2d4c6cb8b9c24d1 SHA-1: a286f8ad4d63fdc55f9cd8c9033402c15f00918e SHA-256: 3bda1468349735a31c167e0ffb38000473a662dda639c36aa4067a783221b8ab
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external PDF documents, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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://botokaw.ru/strik?utm_term=translation+of+de+bello+gallico+1.4
    • http://rabota-plus.club/36896823098fpnrg.pdf
    • http://gonzo-3d.com/nakamichi_cassette_deck_1._5_service_manualk4977.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rejiner/multinomial_logistic_regression_spss_output_interpretation.pdf
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_2a29479b94a8436f9d869f846dad814b.pdf?index=true
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_e8f1194e53e04c5a82f55d1672bd9479.pdf?index=true
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_6c387f782b0046eba3907aa118d8b8b7.pdf?index=true
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_c327d42000fd46fd9aa2bf5c5769fd43.pdf?index=true
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_770c137e97944ff08b94391bdb1d70e6.pdf?index=true
    • https://s3.amazonaws.com/zabejuvijolu/pitomu.pdf
    • https://7fd9f749-07b0-48f8-ad51-68075edef824.filesusr.com/ugd/197648_217d1f3a3bcd4a88a7a77dcad3259921.pdf?index=true
    • https://s3.amazonaws.com/wuwabobujasivor/bujubirufodetafinez.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_68d522d2c0424ceb889590dd994c2ee8.pdf?index=true
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_be4c67b9a81a493196fe4a3cd99f4df8.pdf?index=true
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_ae39bc1272d14fd8916f0f8d33df7b31.pdf?index=true
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_3cfbae072b2f4adb96097a5f74cbb954.pdf?index=true
    • https://s3.amazonaws.com/juvetaso/zofijagiziwirize.pdf
    • https://s3.amazonaws.com/pevarijidasalop/14880661190.pdf
    • https://s3.amazonaws.com/sefepugolupalax/80399970419.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_1a48f555ef8d4d4095cea5955aba8b2f.pdf?index=true
    • 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_off0000e728.bin
46ae316b7ea103949c5b68ab1b3fedaded671fbfc0186dcb751bdd69813be6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 3428 bytes
font_01_sfnt_off0000f36a.bin
264f98daabe1f584cb3adc7c57bd1cbf217ea85956f3bd3e588190a8ee6456f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5452 bytes
font_02_sfnt_off00010609.bin
5104d2679a7044bfe8163e378ad71f592426c59bf57261fc5693aca695674c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 11256 bytes

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