Malicious PDF — malware analysis report

Static analysis result for SHA-256 62418788f3117442…

MALICIOUS

PDF

82.7 KB Created: 2021-10-10 09:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bd2e89e672dfb36e0a02bf9377c5f05 SHA-1: 3ef1a3b61335f5c834fd2684bf5c1abbcbba235e SHA-256: 62418788f3117442cc701bef7b10f65faab4c20eade2bf0cb989e09f54fad855
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://clubslotalmatriche.com/calcas/file/61432493243.pdf
    • http://decorstore.eu/upload/file/47314146027.pdf
    • http://ncfc.com.tr/ckfinder/userfiles/files/86074944547.pdf
    • https://onlinendttraining.com/files/juwakupolunukebedo.pdf
    • https://sbsoftware.ro/admin/userfiles/file/ripisaretasunijikajufepi.pdf
    • http://tk-weld.com/images/library/File/kusubarele.pdf
    • http://leylasuren.com/images/userfiles/imagefile/digafolofalemetusasote.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210923_832D82C8068DF5C5.pdf
    • https://alkathirilaw.com/userfiles/files/43547748373.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/96569091769.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/medasifumejogeva.pdf
    • https://webmedcentralplus.com/userfiles/file/xotefaxejusasogiditoje.pdf
    • https://washlounge.in/ckfinder/userfiles/files/jopuxivop.pdf
    • https://shunnasato.com/ruvofizirepawokawakul.pdf
    • http://zsmnowakowski.pl/userfiles/file/vunusifovunatijog.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/fosoweriripodofivazeni.pdf
    • http://openendrep.com/userfiles/files/fabudaxopepovupif.pdf
    • http://rurisnet.org/images/file/vozav.pdf
    • https://webhosting4.net/media/file/komovojidipebufame.pdf
    • https://ddnepal.com/assets/userfiles/files/69172716738.pdf
    • http://hongsung114.com/files/fckeditor/file/tejuzutux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=alvin+and+the+chipmunks+2+dave
    • 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_off0000d9b0.bin
7c0dcc22a4c12d5871a2290bfce3637bc5d33f950572699266c301576c4ec59c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 19152 bytes
font_01_sfnt_off00010bc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 16792 bytes
font_02_sfnt_off000123df.bin
c355d317b67bdacfc49e3b2e210a4889fb19378daf7f26037c3d3dcb3eb79045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 10916 bytes

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