Malicious PDF — malware analysis report

Static analysis result for SHA-256 517b0c9835941502…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 23:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eba7852dd6cb77295d4ffb7cc2bfbc44 SHA-1: 9c678a284cdb99d2a2da97cc7fc27344b7882b74 SHA-256: 517b0c98359415027cce6c770ca64d4af4b71edd54e332f3b1d63b09c58d61ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://krisoc.ru/uplcv?utm_term=redmi+note+9+pro+update+12.5 PDF link annotation
    • http://assotechne.eu/userfiles/files/13477169082.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/14591247368.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/jisokisovamuvokoburasi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/zudebawirenoridib.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/filivogimukigopif.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f61f4d416---vegemetuv.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/vejefepizowujur.pdfIn PDF document text
    • http://miminku4.com/contents/files/67317646065.pdfIn PDF document text
    • http://autovoda.ru/upload/files/tezamupugeregaxine.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/77612688300.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zewijuro.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/zikegenonumixax.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210919_408E13E1410C6A2B.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/58861583990.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/34405677915.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/kopun.pdfIn PDF document text
    • http://dejede.com/userfiles/file/pogafapisafetuweze.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/55885219286.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA950 16396 bytes
SHA-256: 7bcb1a28845ebc3c3a91cabf75063ccb9dffe490931ea113ac5480154bb6af49
font_01_sfnt_off0000d352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 11024 bytes
SHA-256: f06861aade24848b97446073d6a31067615ba5591552d19764e6bc462c1c164a

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