Malicious PDF — malware analysis report

Static analysis result for SHA-256 9260216e453dd72e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 00:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e9e70c55f35155be9827a9a45b2c093a SHA-1: add66458f826d9933b266543c2aaee4c49987c68 SHA-256: 9260216e453dd72e88b903d65dcbfa731c14ceca4e1189c4456eb28e2f2699f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://hippodrome-compiegne.fr/www/uploads/file/tedodapepuxisebegoli.pdf In PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zejegixanezex.pdfIn PDF document text
    • http://domosplast.hu/files/file/badoxajiz.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109112116575459.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zawusewumisejofapejafak.pdfIn PDF document text
    • http://wdnederland.nl/file/53640169030.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/72833795434.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/waxaguzuruwusarimusav.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/pasaw.pdfIn PDF document text
    • http://contelex.it/userfiles/files/32914913197.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/68829156107.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/34282080798.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/sufubisisuzilodiki.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kjltbl0emkpmu6pbgaevua0dv4/luras.pdfIn PDF document text
    • http://thecuriosityshot.com/molej.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/72704097356.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/21941623125.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/gewiseduvozegojija.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/guwewop.pdfIn PDF document text
    • http://pasted-radio.de/web/files/dapojiwazud.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/21268032021.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/53011953269.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210913144654.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/21698493212.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/81877381195.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3206c88c57b6e2d5ae3e41bcad7301c1/34853805763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=romantic+words+that+start+with+oPDF link annotation
    • 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_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 10588 bytes
SHA-256: f721a44ddb8ff565ee46ae4b159314d662579164e2e7a066c16dc1c957a8c40f
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 17664 bytes
SHA-256: 6d840d2cb4a68c73ecc58b1acbb6a562813a517c90ccab5c3056e309b2c01e65
font_02_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1