Malicious PDF — malware analysis report

Static analysis result for SHA-256 0053861c6e16f7b2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-16 17:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a48ba9db21075d1f4ed3d0c96901ef8c SHA-1: 271f6104de2ec52c70f4829aca7fc7a0953b86cd SHA-256: 0053861c6e16f7b2e674a7c8b56d520109e8f531f2b7c2c41b16c2557e9d10ff
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a potential link farm or SEO manipulation tactic. One of the primary URLs, https://jacksth.ru/strik, is suspicious and likely serves as a lure or a redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=mahindra+tractor+wallpaper+download
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/825c418b55.pdf
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/3555436.pdf
    • http://wamipivifubape.sportsontheweb.net/how_to_clean_big_boss_air_fryer.pdf
    • http://sirunome.mypressonline.com/56930408329.pdf
    • http://bewewafip.scienceontheweb.net/foxadurarorenuwimaf.pdf
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/1413983.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bezegoluzose/cost_estimate_template_excel.pdf
    • http://pikubub.onlinewebshop.net/text_structure_definition_5th_grade.pdf
    • https://s3.amazonaws.com/kikunojulejuj/how_to_use_procreate_basics.pdf
    • https://s3.amazonaws.com/wizuluworafid/ssc_admit_card_direct_link.pdf
    • https://s3.amazonaws.com/muvazi/mumapafijoliduvudokax.pdf
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_204a27662f7b4c528be784773c1d7893.pdf?index=true
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_63cd1efa38714d55861043f7cdb36b8e.pdf?index=true
    • http://nejesezape.myartsonline.com/add_2nd_edition_character_sheet_excel.pdf
    • http://perexuwofogefo.onlinewebshop.net/convert_tex_to_command_line.pdf
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_b7226c40bb664f4e93e1a7da44e68d9a.pdf?index=true
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_77679009f0de4e68a78c49678e8d9d9c.pdf?index=true
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_9dc2f0e370124efe812dddd099038681.pdf?index=true
    • https://s3.amazonaws.com/sepovutapakogaf/28495959737.pdf
    • https://s3.amazonaws.com/sajezife/zibisetizirowipakak.pdf
    • https://s3.amazonaws.com/sajezife/franny_and_zooey_audiobook_download_free.pdf
    • http://tuzuxutetug.atwebpages.com/sri_rudram_laghunyasam_sanskrit.pdf
    • https://s3.amazonaws.com/votubukaxogilix/sociolinguistics_noun.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_off0000ece6.bin
94f848dcad41f3dd6bdc62126270e7c936209c4669b14a186cb6c2a64d13c9bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 5080 bytes
font_01_sfnt_off0000fe44.bin
dedbe48eb50e073fdbede4a5fad5dc77732ac8ad7c58b8f56e88cafdd04fc8cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10504 bytes

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