Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fc8ad24668aee3…

MALICIOUS

PDF

87.2 KB Created: 2021-09-24 11:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbc0d4a2a19d3ab590fe62ca0abc0c24 SHA-1: 17c83a3f5bbb7c4eaa5c50ac0e118854babbc682 SHA-256: b5fc8ad24668aee3a52d7033ca4e53590635965fa3e7665f8c82eedb4fef86c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, pointing to numerous external URLs. One such URL, 'https://allytemp.ru/uplcv?utm_term=redmi+note+9+pro+call+sound+problem', is embedded, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=redmi+note+9+pro+call+sound+problem PDF link annotation
    • http://henzefashion.com/userfiles/file/43412615652.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/wugonizubufudid.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/dafetemalukuwowugifane.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/xejadenozakokopigud.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/fevololodo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cb33f14a6af781d31fc9de2df2142aa7/68062009200.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613962cec6a24---88938613113.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/kebakawiniwexuxareroped.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/xegimuxumate.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/tasadaxazurujilulufibu.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/70641138914.pdfIn PDF document text
    • https://pcetravel.com/files/file/85936441373.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/39257540085.pdfIn PDF document text
    • http://i-physiology.ru/upload/lubibabogomog.pdfIn PDF document text
    • http://etkenkalip.com/files/51341897111.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/povanedutonanopoxolino.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/4184021837.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/gixilali.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/21983367181.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/rajafosiwuxin.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/maragovojumos.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 17772 bytes
SHA-256: 1de954a4f0b43918cd85b8101b18aa691d985489131b459023c221a6a0c75e95
font_01_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 11128 bytes
SHA-256: e7cc2270b0038756cc3dc8439346321e4e766980a99cb0d3236cab78b85cde75
font_02_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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