Malicious PDF — malware analysis report

Static analysis result for SHA-256 df53526568b2cb76…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 19:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1886b1c719c6f20d21e425c4b4c12e9a SHA-1: 578977a9cc5da0bbfd7a78453df4feb2555754c0 SHA-256: df53526568b2cb767f0b1a23ed6123f304a6bf7b389fe04594a58b8c81060320
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://1night2day.com/UserFiles/file/98210515503.pdf
    • https://mabuksusu.com/contents/files/dinigufeze.pdf
    • https://sakura-bashi.com/uploads/files/202109140313128139.pdf
    • http://studioesflores.pl/obrazy/file/wufer.pdf
    • https://micro-logic.ro/images/uploaded/file/35165921826.pdf
    • https://adikketiga.com/contents/files/39604889708.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7aca3fe72---wotoxagofena.pdf
    • http://jumpinfit.it/userfiles/files/92861442169.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/pujemomisuwelogalu.pdf
    • http://bumsnab.ru/uploads/files/mirijidojarexoxidagime.pdf
    • https://renesens21.com/ressources/upload/files/dudubiwomiwor.pdf
    • http://transcash.com/ci/userfiles/files/90817102415.pdf
    • http://salt17.com/userfiles/files/mudufid.pdf
    • https://daquin-ferriere.fr/userfiles/file/kepadedaz.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/luwevas.pdf
    • http://mydreamtuscanwedding.com/editor_up/lipojogonalali.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/uekmehrnpnm01ah954gomahl0r/fatewinidese.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/42117004090.pdf
    • http://www.europesolidaire.eu/userfiles/files/mamege.pdf
    • http://struttur-arch.it/userfiles/files/51645798338.pdf
    • http://carscaso.com/js/upload/files/suwizopojijikosebifoximo.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/1251224264.pdf
    • http://tetrafluoro.com/upload/files/rirufajoxoba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pes+4+apk
    • 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_off0000b2d8.bin
b3383ced4c352e7305b1066734c138166257f08f1662777087f4ff0ff976c23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D8 17104 bytes
font_01_sfnt_off0000de79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 16792 bytes
font_02_sfnt_off0000f68f.bin
fae92907a0014cde9a35a63f1ac22f90bd911c47500c69029997a89a3821ee29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 9856 bytes

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