Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f31d0244c50be63…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 00:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad38bf69091bb5529bb60094155a3e53 SHA-1: c4444e04bf8771afc593b434423720b9120cc0db SHA-256: 0f31d0244c50be630456a2965448710c812d685ec2460c4fbc519b269b5ec55e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a payment redirection lure. The PDF contains numerous links to disposable domains, suggesting an attempt to obfuscate the true destination or host multiple phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=happymod+fifa+21 PDF link annotation
    • http://vaness-sens.fr/ckfinder/userfiles/files/87513729742.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5ffa1b4b45d497150c38c187efeaa585/33272851621.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2b6ac778---27930624050.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/pedafekivebugowal.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/siledolikotagawunuf.pdfIn PDF document text
    • http://builderall.info/userfiles/file/80295723102.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maxad.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210909_53D04660F7232EA5.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/rogiriramigajiwoje.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/sepimaxora.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/gobawatenufuludasa.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/vawuw.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/dedab.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/37142646783.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/sefekipol.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/tusibufokolo.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/pelilesedijefagi.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/roxaletemepumerijomajesem.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/28395199829.pdfIn PDF document text
    • https://activepymes.com/pub/file/72761572675.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/pimajadideme.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_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 10288 bytes
SHA-256: eb99ea872e8d662f9691143c5869c5e4db60f6d4c5095354b7307fbc9c42581c
font_02_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 19008 bytes
SHA-256: 1ac48e1b95a48d1237cb30a1ef29b6eae21d4f83250b706b40f11a3d3fa2db06

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