Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2db581cc6f39fa…

MALICIOUS

PDF

76.9 KB Created: 2021-09-25 17:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9d8af3f6c92dc4e64621097ab7e3db3 SHA-1: 8f1f0a8ea9f96e3db42608cba497e19b0b3c64ae SHA-256: ba2db581cc6f39faa7813ac84217e523386c176d7bb02b09fb60db742faaeb7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to suspicious domains, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and numerous distinct hosts suggest it's part of a larger campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=earphone+mode+android PDF link annotation
    • http://avanti-kuhni.ru/upload/files/pefat.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/sanuduzokiwo.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/jolibasivejuzeb.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pemilesi.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/57984640189.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210901_C323A0B22EC69A59.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/kagasupaverasad.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/6253589723.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/88490994801.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/99106244481.pdfIn PDF document text
    • http://pactolous.hu/upload/file/65616077875.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/5886224164.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/793387815555a9e39e770dc0e3a97ab2/defuvosutobovapumorejijab.pdfIn PDF document text
    • https://qnzar.com/files/josibe.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/42751046148.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/38063497933.pdfIn PDF document text
    • https://themalc.org/files/file/gojanojib.pdfIn PDF document text
    • http://carszana.com/image/upload/File/fabuja.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/rewon.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/98613971431.pdfIn PDF document text
    • http://cwesp.biz/upload/file/83400720437.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/funakagizufoperun.pdfIn PDF document text
    • http://101balkon.ru/upload/files/lulaniwofebevozuko.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/84394240590.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_off0000c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37A 19792 bytes
SHA-256: e4942b0749faa3b042803cb39cdfd0aa2c92bfcaa1bd0100c74f27a666bb38ac
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10328 bytes
SHA-256: 79feea861e6bebafe5261fe047f6b1c7f2e6c86542b2af589a37267b41a20934
font_02_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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