Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b14123d3cc22bb…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 01:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2c089e45a92a2b38c0f0d8045d1bae1b SHA-1: 1dea291b86c0912737ef781a379f81e41c3eefe9 SHA-256: 61b14123d3cc22bbd2aea2eb20be1df2370d0f294999fe1897e41de11a0c1fa9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many distinct hosts and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=robocop+mortal+kombat PDF link annotation
    • http://timandlor.com/userfiles/file/41855111982.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/lekabifaredatiwe.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/60465355758.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/80547668775.pdfIn PDF document text
    • https://suruburi.net/mm/file/50896557104.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/66974595792.pdfIn PDF document text
    • https://ksuskalology.com/images/file/95696864225.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/sapixurake.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/ponoguxojasasegibedutaje.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/vixowanox.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/67539163798.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/xolekejakorudujujaz.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d27dd2e0bc546177b544a21182cc23ca/fupov.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/kilewabe.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/77092653416.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/keris.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/26812153957.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fa3372579c7f063d417b8e4b9371c97f/43803443724.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/wozodadifizodinutuvigu.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/87622050620.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/69748569424.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/52491700039.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/vifivilokakubim.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/mowepukudem.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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 17952 bytes
SHA-256: 0dfc1b2cd921356146019db37287d8caf582bf63463967541391431b88df76ed
font_02_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 10316 bytes
SHA-256: b9a43524ceec9892ccfb59697bf820610d1f5de5001192da7b25fdeb8c21f730

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