Malicious PDF — malware analysis report

Static analysis result for SHA-256 8332563c8af0e7a2…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 14:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b643dd38d3362f13f6d2a86ca922f5a SHA-1: d4a7bfb8e0c905c922e15eb8c2cf8c494c4a09e0 SHA-256: 8332563c8af0e7a2442c4336eeffb60f544f52e47cf76689b551c881975b6635
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, and is flagged as a link farm. This suggests the document's primary purpose is to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.q-jin.ne.jp/ckfinder/userfiles/files/39385132408.pdf
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/12005463001.pdf
    • http://tuclubcr.com/campannas/file/66443986742.pdf
    • http://tienhasteel.com/app/webroot/upload/files/48571133167.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8af0acea7---74730938506.pdf
    • http://ls12368.com/userfiles/file/53537769974.pdf
    • http://arniuniversity.in/ci/userfiles/files/62082813452.pdf
    • http://biancoacolori.it/userfiles/files/dewaxomenizabifegami.pdf
    • http://digifast.cz/userfiles/suxumudisifepe.pdf
    • https://girisimhaber.com/uploads/file/nelapeli.pdf
    • http://amexeuro.com/an3_Uploads/file/mezanitodudedemeseve.pdf
    • http://excitechem.com/userfiles/file/jujojolimukugozulakeb.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/32470658145.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06416a456---23904378474.pdf
    • https://kaparatt.com/images/File/26945356097.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/47945480982.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/fusot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=n64+emulator+mario+64
    • 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_off0000ab43.bin
29e388ed27801a9a5d44ccb780cb444afbf55c99d9e370bb64b3577a118b6075		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB43 10320 bytes
font_01_sfnt_off0000c299.bin
e6b88d0786cd42095a25a2f6ccc40000dc555f0b3e1de7f84ea880f219d474cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC299 16400 bytes
font_02_sfnt_off0000ec71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 16792 bytes

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