Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba944543ded1df9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 09:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24b6070ff79ed895b42e8de029d1a5ad SHA-1: 6fa1cfba14ea0dbef83d05eea034fbe137281d96 SHA-256: 3ba944543ded1df97d50b3fbed290cdb3903b81d8a6adecd583b5a5ca01ee056
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially harmful websites. The PDF structure and numerous links suggest a link farm or phishing lure designed to distribute further malware or collect user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=lamour+app+download+apk
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/wedimovojoxosasoxej.pdf
    • http://gearcon-eng.com/file_media/file_image/file/84158475779.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaa9033d0---mubiferudipaxifovedol.pdf
    • http://ch-bovi.com/upload/files/ripodi.pdf
    • http://liveranigioielli.it/userfiles/files/54731624047.pdf
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/75454499839.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/98292529695.pdf
    • https://accuratesearch.com/userfiles/file/kupavonunidomubelugasedug.pdf
    • https://greenways.at/userfiles/file/farililu.pdf
    • http://esejsc.com/upload/files/purenaguririjajesafexo.pdf
    • https://siemreaptraveltours.com/userfiles/file/43428489231.pdf
    • http://aimecostruzioni.it/userfiles/files/gepeja.pdf
    • http://secondhandgraphics.com/usrfiles/file/faxota.pdf
    • https://everestart.com/images/stories/file/woridaxox.pdf
    • http://thanhcongtechtra.com/upload/files/61533880062.pdf
    • http://around-sicily.net/userfiles/file/nodurifunezoro.pdf
    • http://hladonural.ru/upload_picture/pamuwusemixa.pdf
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/mekikokegizixawa.pdf
    • http://alacartedesign.de/userfiles/file/398834399.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134f46e8e3ed---kilifaxopuvibirexig.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/wejumejosoxizalixaditutoj.pdf
    • http://fuyu.010bi.com/ckfinder/userfiles/files/88515142907.pdf
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/23463777453.pdf
    • http://jjkxmy.com/upload/files/202109090325259359.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_off0000ddeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 16792 bytes
font_01_sfnt_off0000f5fd.bin
4cc7a6e62a60c91245cee8e8d288ba42b0a6368b127bc750151e203a244541d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 18556 bytes
font_02_sfnt_off000125fb.bin
ec90437910f32cb43a4df67f6893b2a5a75b585054d09c3b2137a4c8e176992d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 10300 bytes

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