Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7518a9d0b9f8d44…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 11:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e13300a59492f99e25b1d57bb87b922 SHA-1: 0a310a57dc73514a41227c8c97d307877a675d1d SHA-256: d7518a9d0b9f8d4491d865803eb8bc78759de6fb88edc2905eacfe6b940d3bb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a first stage in a phishing or malware delivery chain.

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://coretry.ru/uplcv?utm_term=text+adventure+android
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136028db69d8---83336106140.pdf
    • http://grandp.ru/userfiles/file/93138404923.pdf
    • http://forma8.kz/ckfinder/userfiles/files/jepezixawuz.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/xajab.pdf
    • http://leadingedgecorporate.com/user_images/file/ziwogodugomivexi.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/fowizebunutos.pdf
    • http://sensitiva.fi/UserFiles/File/96454242472.pdf
    • https://betentour.com/sites/default/files/file/wivubuse.pdf
    • https://batikatravels.com/userfiles/file/46198521473.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/54130586716.pdf
    • http://ajk-opakowania.eu/upload/fck/file/sujavud.pdf
    • http://qunjl.com/userfiles/files/41492550891.pdf
    • http://premiercontractinginc.com/files/file/77975986450.pdf
    • http://ducthoaudio.com/upload/files/29677291417.pdf
    • http://unseretochter.ch/images/file/bejegatozapiku.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/wevidexat.pdf
    • http://ateliergermain.org/sites/default/files/file/fojenasotipotoxif.pdf
    • http://nzozkrowodrza.pl/uploads/editor/file/zobadojapiruti.pdf
    • http://starma.pl/files/file/kunepepaziwekatenezegir.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/40682169945.pdf
    • https://www.karelo.com/uploads/File/17110903798.pdf
    • http://starroadchina.com/userfiles/file/gimelilikimuruvelesus.pdf
    • http://classicalgardenornaments.com/uplds/file/72367707448.pdf
    • http://jcnjl.com/userfiles/files/wixuluvisatatunixigalitul.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0303b87b851f6af938e3173be14ed08a/puduxu.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_off0000da1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 16792 bytes
font_01_sfnt_off0000f22e.bin
d4777af462c521792c647c89e76b9556008c4418dc00e6f11e37e6baa4e7c403		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 17692 bytes
font_02_sfnt_off00011fec.bin
92c7ff4fc612ffc5d3ad1b8d145d6c1ed9c331d369bdea1843c402634f1b7412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 10260 bytes

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