Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fa8906ea6ce915…

MALICIOUS

PDF

85.6 KB Created: 2021-03-15 23:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddb8f4b4298d7672fc507730675605b4 SHA-1: 9aaafe56080c3015ee9b4113dea45b9be4357223 SHA-256: a9fa8906ea6ce915f9d9c223718766e002a844444823e4bd1caff6f7363ff892
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, but the presence of numerous external URIs indicates an attempt to redirect the user to external, potentially harmful, 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-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://lozipotod.ru/123?utm_term=mn+dnr+trout+stocking+report
    • https://rikodagipavas.weebly.com/uploads/1/3/4/3/134334006/3517607.pdf
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/2b62a1518da8.pdf
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/6268958.pdf
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/8539447.pdf
    • http://fitit.space/dyson_cinetic_big_ball_animal_vacuum_filter_cleaning7m8zb.pdf
    • http://zetumitufam.mywebcommunity.org/dakopekoz.pdf
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/8162308.pdf
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/6aa818b5.pdf
    • http://natnat.fun/xiliselesojewitifamutumia1fwm.pdf
    • https://niresofet.weebly.com/uploads/1/3/2/6/132682193/balumevotowup-dupob.pdf
    • http://pebonemariv.mypressonline.com/algebraic_geometry_physics.pdf
    • http://ueuniti.xyz/multifactor_productivity_examplefrfkz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1cf0f80c-60ec-495f-8044-aa3d7a3103ef/tebufizora.pdf
    • http://niselasot.atwebpages.com/28356148882.pdf
    • https://uploads.strikinglycdn.com/files/38a790f8-dc97-4acc-925d-b290eba0dbb5/rewapokurudetelanadi.pdf
    • https://uploads.strikinglycdn.com/files/c752bae5-6f85-40f4-98c5-0077813e4791/beats_by_dre_solo_3_pro.pdf
    • http://wenares.myartsonline.com/bodyboss_superfood_free_download.pdf
    • https://uploads.strikinglycdn.com/files/932a02c3-76ec-4a04-9f3f-39c3e03067e6/juboramalukimiridoz.pdf
    • https://uploads.strikinglycdn.com/files/2f2b3d04-e224-499a-b586-010502ea206c/what_is_the_function_of_the_kernel_of_an_operating_system_quizlet.pdf
    • https://uploads.strikinglycdn.com/files/23e2f040-e2bf-4b13-9629-65e5653b1101/marantec_m4500e_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010708.bin
ef0ff104ea44b4f76f2e317c05d944ff73adab4e11d451763276b796cfc564ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 2868 bytes
font_01_sfnt_off0001113a.bin
6336493a0c3c591bcae9206479883f29fd7b1ca23272813e4833a5df4ff09058		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 5068 bytes
font_02_sfnt_off0001229d.bin
518f121758dc07b7e4a114620fa7d006b25153838285da9b7aed012e4cc9b4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 10956 bytes

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