Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a0fba5fc7a0aab…

MALICIOUS

PDF

85.9 KB Created: 2021-03-29 11:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ee9d693069bcf0f2f47e237ad170ca1 SHA-1: e7848ea9063231240ce7b8dfd26edf0025fc2a45 SHA-256: 92a0fba5fc7a0aab8e64c2d76ee51aeff1b12e3c56cfe019768fd84d0e5b4a8f
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 high likelihood of malicious intent. The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_LINK_FARM heuristics suggests the document is designed to redirect users 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://seumenha.ru/award?keyword=ableton+live+9+lite+tutorial+pdf
    • https://cdn.sqhk.co/novupezezis/hgiaRvz/wituwuvizokumiruzozem.pdf
    • https://cdn.sqhk.co/tumosirewuw/FqcUtge/play_shoot_em_up_games_online.pdf
    • https://cdn.sqhk.co/zejizoguzut/eidjhie/95211769124.pdf
    • https://cdn.sqhk.co/feripamapuv/jc7rqid/hokey_cokey_flavor.pdf
    • https://cdn.sqhk.co/wadusazilox/7y9AgJX/instagram_hashtags_for_fashion_designers.pdf
    • https://cdn-cms.f-static.net/uploads/4404980/normal_6016fcd8053d6.pdf
    • https://cdn-cms.f-static.net/uploads/4493600/normal_602d93e9d5f24.pdf
    • https://static.s123-cdn-static.com/uploads/4482631/normal_600997d0e82a9.pdf
    • https://cdn.sqhk.co/fonizijodi/bUbvgie/premam_background_music_telugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dezajok/windows_10_for_dummies_free_download.pdf
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_f5a8f13649ae45fe891c5fd1b35063e7.pdf?index=true
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_62fa8ee509544df4ac8a9188b7604f0b.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_d246b85216e54f47aa7a322758598fd2.pdf?index=true
    • https://s3.amazonaws.com/nitizobuv/96345693309.pdf
    • https://s3.amazonaws.com/donake/77241086979.pdf
    • https://s3.amazonaws.com/tipikaxe/28303105445.pdf
    • https://s3.amazonaws.com/teximikamukubo/76741163063.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_off00011154.bin
ed0bc47395d8af1d8a88b8a1518e23cc846a77cdc4e58f502fec77c223cec6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 5200 bytes
font_01_sfnt_off00012315.bin
70627279388675891f43853936f7c485ef858e3f20e0984e3caa0e0a01bf2507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 11628 bytes

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