Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6dfdbbcdbc219d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 18:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5ddcb2bd6f6a89adfe06f18f6d6470c SHA-1: 1c1db4f8c90fa69a40b0e2cf19f36c62b02205a0 SHA-256: fd6dfdbbcdbc219dd27d329a11b07a1e3fe124d8a9d0c4e700db175cf105fec4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and numerous external links indicate it's designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431569b236d---32317905076.pdf
    • https://acrgroup.nl/userfiles/file/wekesularidoxafurelurupux.pdf
    • http://www.mab-solutions.fr/upload/file/vebifirexexorivanot.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/66352265452.pdf
    • https://nstyapi.com/resimler/files/72731672127.pdf
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/61647432598.pdf
    • http://moneymaker-gold.de/files/56564510393.pdf
    • http://linker-apps.com/files/rulofozazamonokamijopo.pdf
    • https://wisestudentz.com/userfiles/file/sujiximosof.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/62340187399.pdf
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/sowoziwi.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133faee85dcb---tiwabafukira.pdf
    • http://abwhopewell.com/uploads/files/59499210590.pdf
    • http://asesoriazabalburu.org/azaba/files/file/velizejezujadilapugon.pdf
    • http://quaisetoiles.fr/img_pages/file/zakovusibimarexetid.pdf
    • http://brukbet.com/user_images/file/kerenofukotetidamusun.pdf
    • http://rujiahk.com/uploadfiles/file/fenoseba.pdf
    • http://villabrown.it/userfiles/files/69040116640.pdf
    • http://cx-gl.hu/images/files/66848784034.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/vofilavixoliludupepa.pdf
    • http://zzfcw.com/file/fkimg/file/dudakipun.pdf
    • http://ratchee.com/ckfinder/userfiles/files/75039703725.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+two+types+of+application+software
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/giwajejisaxogefuxo.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_off0000e8b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 16792 bytes
font_01_sfnt_off000100c8.bin
92a875a473b446320d2d85eef87b287ad59cc3d5e618842c9080931d54e8c652		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 10740 bytes
font_02_sfnt_off0001198b.bin
4e7483d3c5f63201c9acb998259bb0796cb2fe96dd1c497fd499151678b546fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 18104 bytes

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