Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e841c722b1ffc7c…

MALICIOUS

PDF

66.4 KB Created: 2021-04-18 06:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7587c8b70a9f3401c83b94f13449a4f5 SHA-1: 75552b56b38a9f5f1ad83b15e0045bd2ee886d0e SHA-256: 9e841c722b1ffc7ce837d1e218cc4a52360d211ad1b556e08dec34c7f0ccf44a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://botokaw.ru/strik?utm_term=pokemon+sword+and+shield+foreign+ditto+trade+reddit', is presented as a search result, likely to trick users into clicking through to malicious content. No scripts were extracted, but the extensive link farm and the nature of the heuristic firings strongly indicate a phishing or redirection attack.

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://botokaw.ru/strik?utm_term=pokemon+sword+and+shield+foreign+ditto+trade+reddit
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/turenowalino.pdf
    • https://cdn.sqhk.co/fezifenax/ib5Khaq/gems_calc_clash_of_clans.pdf
    • https://cdn.sqhk.co/jeporikate/OGXcvie/carnatic_vocal_music_classes_in_adyar.pdf
    • https://morapunepa.weebly.com/uploads/1/3/1/6/131606469/3120674.pdf
    • https://roneresikixa.weebly.com/uploads/1/3/4/4/134476702/9611180.pdf
    • https://cdn.sqhk.co/navotezive/gzqmvie/find_my_iphone_app_on_mac.pdf
    • http://sizuxofutitarax.mypressonline.com/paradise_lost_book_9_line_by_line_translation.pdf
    • https://cdn.sqhk.co/lanumakefu/DRjco17/49969927003.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_6039c5bb7477a.pdf
    • https://lifezubolafa.weebly.com/uploads/1/3/4/7/134715310/fipixo.pdf
    • https://kesavowefobulet.weebly.com/uploads/1/3/5/9/135976175/levuzofoje_pazesix_kitipin_jedijawijel.pdf
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/2875379.pdf
    • http://xuroriwonufuz.scienceontheweb.net/clasificacin_de_los_numeros_reales_ejemplos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leteraxewe/zuzezajawimu.pdf
    • https://s3.amazonaws.com/dipafuxe/the_devotion_of_suspect_x_full_movie_online.pdf
    • https://s3.amazonaws.com/pasutiz/sukesokiseladesumoroti.pdf
    • http://lawiferow.myartsonline.com/74454475530.pdf
    • http://kepagewav.atwebpages.com/33839204743.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_off0000c60a.bin
219d948173fcc7f352bbd77a67721960b043b1f35d2d60db1e3ee44e22eaf89a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC60A 5476 bytes
font_01_sfnt_off0000d895.bin
6a98534bb0c99bc5e97aae215ed3730a34b54bb57cc9c70c5084746fcc1820f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 9772 bytes

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