Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce604fd63759839…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 20:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42f064578f7b4a3e5e21e2df9cffceb6 SHA-1: 705517983c5e286227590fec068aa348a697eaa5 SHA-256: bce604fd63759839fd634cdbc6670ce6a366e871bfd1581891b3f8c11822ea5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://studiomalpocher.it/userfiles/files/bitibatetorulusugekopaxas.pdf
    • http://osingenieria.com/images/admin/file/ravubure.pdf
    • http://texinpack.com/uploadfile/file///2021090101241161.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6ecf96d---58103353262.pdf
    • http://centrlita.ru/archive/image/file/xizuredibejowodav.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/papez.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133552d02057---48222461472.pdf
    • http://clingac.es/d/files/70867687017.pdf
    • http://szerecsen.hu/editor_up/1296852754.pdf
    • http://medizator.ru/ckfinder/userfiles/files/lukebosazegepebumes.pdf
    • http://centralgiving.com/media/userfiles/file/fofirutawezijow.pdf
    • https://yukkumpulgroup2.com/contents/files/45011909232.pdf
    • https://thegioibaobicarton.com/Images_upload/files/88043469064.pdf
    • http://arebiatours.com/uploads/files/22874633584.pdf
    • http://mail-ex.net/userfiles/file/44580891345.pdf
    • http://nyitotthaz.hu/userfiles/files/sapokiso.pdf
    • https://manorhair.com/uploads/files/202109021001593205.pdf
    • http://originalcheck.it/public/img_admin/file///26783320955.pdf
    • https://aqua2go.pl/galeria/file/vojena.pdf
    • https://sanipacific.com/attachment/file/rikagirejusobokipomob.pdf
    • http://mcutech.net/files/75534591709.pdf
    • http://dinhvi5s.com/images/newtech/files/50453480439.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=effect+of+youth+unemployment+in+nigeria+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 16792 bytes
font_01_sfnt_off0000cacd.bin
22af56ffc0425874b3ab46241445cbf0359b7e230f2ba1d204c32c4c63caf835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACD 11096 bytes
font_02_sfnt_off0000e435.bin
e0591c1d8562df890a6d0932c9d8a8f64698dcd1f79466dc7f3fcd229c8b87e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16388 bytes

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