Malicious PDF — malware analysis report

Static analysis result for SHA-256 7256d5aaf805e360…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 17:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6603140191fd3386d3645f4fd58f7c8 SHA-1: 3ff709487bdbe41cadae8f81a2fbb262282ac97d SHA-256: 7256d5aaf805e3609ecb94aa9098e97eb18628d35d750cbef2b475deb933339a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. Numerous external URIs are embedded, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=bubble+shooter+game+online+play+now PDF link annotation
    • https://sport-jicin.cz/dokumenty/jubepebolivanijir.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/xesuxamewo.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kujunonip.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/betago.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908080430.pdfIn PDF document text
    • http://ecole.ru/text/images/file/46213986087.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/gunewadi.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/gavovavi.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/40784813883.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/fidalakedapumufozo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090910081988.pdfIn PDF document text
    • http://japhina.com/upload/file/59682055983.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/1366683242.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090600313312.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905161928.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/99105938592.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ponigepu.pdfIn PDF document text
    • http://fteq.ru/files/file/37380348900.pdfIn PDF document text
    • http://charontrade.hu/data/file/10902686195.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/xavin.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a34b3e9e---58281267140.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/guxafu.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/79927838673.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/faxafojis.pdfIn PDF document text
    • 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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 11192 bytes
SHA-256: 0a5301b2080e0d2cd10fa9dc11330ea681160b229805cce80141b63361316064
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 18092 bytes
SHA-256: d48981f94303555264b088d38b0caf6c458e7aa787b69230bb37a51a6239e2ea

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