Malicious PDF — malware analysis report

Static analysis result for SHA-256 825a04e1c158bb31…

MALICIOUS

PDF

78.7 KB Created: 2021-03-22 18:33:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5ca1aa0fa28b48cb5ddf894b82bac21 SHA-1: b4ffe6063ce4ba6c5a44d74c4581af946995db41 SHA-256: 825a04e1c158bb312bb8db70ce909fb9df3eae2ef2267a2548fb1db84b7b7ff4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, including one to 'golowaki.ru' disguised as a search result for a game ROM, and another to 'atomyimperial.ru' as part of a link farm. The document body, though heavily obfuscated, appears to contain keywords related to the lure, suggesting an attempt to direct users to malicious content or download further malware.

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://golowaki.ru/wix?keyword=mario+kart+ds+rom+hack
    • http://atomyimperial.ru/moborulotewopatilofismm3s.pdf
    • http://gosoxegekiri.mywebcommunity.org/how_to_lose_male_body_fat.pdf
    • http://todayit.pro/52201415820lnwv5.pdf
    • http://sumodena.getenjoyment.net/peyote_stitch_beading_projects.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/32396193765.pdf
    • http://shop50off.info/62685096060ftrhe.pdf
    • http://static-get.top/community_centre_evening_classes_ielts_listening_answerss944m.pdf
    • http://tojuvapemupo.mywebcommunity.org/juwerefonefunediwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vidadaviwal/kizovubatagev.pdf
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_d3869aa240964528b2a7b9d38795a4cd.pdf?index=true
    • https://s3.amazonaws.com/nuvukivaxiren/bugoko.pdf
    • https://s3.amazonaws.com/gezetega/tadolovap.pdf
    • https://s3.amazonaws.com/pasawe/77127461197.pdf
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_72d173e97537465ebea3a37a268ad4e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/69413c4e-51d7-4e4a-95f9-f5ebb9298498/tifodobesaropulupivej.pdf
    • https://s3.amazonaws.com/nagev/short_professional_bio_template_word.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/pih_rcog_guidelines.pdf
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_b70f789661794f33ae6ce0949fd1487d.pdf?index=true
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_46c70957ac494d3bb994f22fa27e08ed.pdf?index=true
    • https://s3.amazonaws.com/lanaladu/dejadurivaloka.pdf
    • http://raxegujanamefas.atwebpages.com/29727982365.pdf
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_877c9b0d82914b1f8e4cb68b19abcfe1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/185e0b0a-2648-4779-832e-46df29fbff82/xetal.pdf
    • https://s3.amazonaws.com/dazinibonofobi/bitdefender_2019_offline_installer.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_off0000f7d7.bin
005cefaf97527c339a080d9acdebde8979a592aaedd2a68a7ced1bb28da488fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 5216 bytes
font_01_sfnt_off00010977.bin
2386a46f50b9a1470d802fdef5a7bfc2b5fdcd9cff2afc26b47c17f95f51f206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 10740 bytes

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