Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f002bce36cae82…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 12:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 78de9d14d3a21316d7be10ad318fff89 SHA-1: 0e444cecd32b82032518ae328ffab3214b3245a6 SHA-256: f8f002bce36cae822efe127bb3568eebf198bbd489f49e8c26dcd686f9167184
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://desco.scp.hr/files/95147469157.pdf In PDF document text
    • http://ceramkgres.ru/userfiles/file/nepunimufezidi.pdfIn PDF document text
    • http://video-cycling.de/files/file/2135027929.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/25059165041.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/morevajiduvikoditedede.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/75503884038.pdfIn PDF document text
    • https://go2germany.ru/files/file/32801637228.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/61940554738.pdfIn PDF document text
    • http://ccshecea.org/upload/files/69507844249.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/leninazotusafeponexoz.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38934528613.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/dazikovazedalabojused.pdfIn PDF document text
    • http://halaljones.com/uploads/files/95780128425.pdfIn PDF document text
    • https://edex.co/userfiles/files/64362367578.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/67035900065.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/vijafaseduzu.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/futafururetunatanajo.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/wosumetisonu.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/kinaposapekamipugapo.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/zajanuguromudo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5fb7892a---mugubesivebulisi.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/7825991310.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/4592796248.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2v3tq8hu5sbuvb2g5q97fj570/rasokibakapupaluvabuzanoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=commas+worksheet+grade+6PDF 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_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 17560 bytes
SHA-256: 3be225e743e5621993842687ecd14ef3d9c32a0a7bed68fc1dac12829d89d373
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 10832 bytes
SHA-256: 4047db7716002a11283148f45445e68d9e174f85da8a56ee24899edceb03eb54

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