Malicious PDF — malware analysis report

Static analysis result for SHA-256 2557c1967dbcd486…

MALICIOUS

PDF

69.6 KB Created: 2021-09-18 16:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1b7a919509a6388f6590a3161aed9e7 SHA-1: 00446f8a36247b1a254d4274111feb42a9d80fa8 SHA-256: 2557c1967dbcd4869b9295a6802c6bdc89fe32665c40bf7375635a0359568385
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://inwebjor.ru/uplcv?utm_term=forza+4+download+android
    • http://aptekadc.pl/userfiles/userfile/91624606610.pdf
    • https://ceccarmaramures.ro/userfiles/file/tagoviga.pdf
    • http://teresachild.com/upload/files/73540617333.pdf
    • http://cottoneauto.it/userfiles/files/56823882081.pdf
    • https://pacantioquia.org/aym_image/files/86564646333.pdf
    • https://milosislandrooms.gr/userfiles/file/redipomiwubavikofolubopo.pdf
    • https://stcc-sa.com/motakamel/Ups/files/venexotupurave.pdf
    • http://gold-carsales.com/js/upload/files/70250551395.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/r3gjn4pa99mum37ena5h0f9o7d/61366098752.pdf
    • http://celeb.huh.hu/UserFiles/File/54503949037.pdf
    • https://stoneappeal.in/FCKeditor/file/60292446877.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/ziruneragufasil.pdf
    • http://riph.pl/userfiles/file/padaporojamijiwibibebe.pdf
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/fifatujunaxunime.pdf
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/44247301973.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/vozanuxiworuvopod.pdf
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/katifezasirakanoremokurim.pdf
    • http://tuzoltosagmihald.hu/userfiles/file/20528958702.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/54156592308.pdf
    • http://zap-interactive.com/uploads/files/44268787436.pdf
    • http://kbfrutos.sk/images/_file/pejakosagaxabirukibefo.pdf
    • https://kaowei.tw/image/files/20210907_005318.pdf
    • http://jun-travel.com/userfiles/file/83369377271.pdf
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/46897346159.pdf
    • http://babyindex.nl/images/uploads/vepaxosinewowepifetojes.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbbac011f---doxexarukemibogawutuw.pdf
    • http://szakkepzosiklos.hu/upload/file/zitokutiwe.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_off0000b657.bin
a294559231ac8444637054f24795fe2279de34afcf3d38156a43fb3d7586432e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 14220 bytes
font_01_sfnt_off0000d9e9.bin
e2e1c5a6e5a9f2ee1cd41c10f7c92ccb6981a3bd77076c336175ecafebcbc8b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 10044 bytes
font_02_sfnt_off0000f059.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 16792 bytes

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