Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6064f3d89f4b97…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 11:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06d67cf8ccb831109207ee11f8ed18f7 SHA-1: 00bcc37de2bae3d971fc16035218a96d8782d05e SHA-256: 4a6064f3d89f4b97587e86b35e0f1dc979d3203b39000581a27d5bbaf576dece
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating a tactic to obscure the true malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://yushendesign.com/images_fck/file/1630483733.pdf
    • http://goldenpeak.it/userfiles/files/kajomugisorosejetusu.pdf
    • http://qkmedica.com/uploads/userfiles/file/zalutesesuz.pdf
    • http://jyjwqj.com/uploadfile/file///2021091605063971.pdf
    • https://parisnordmedical.fr/docs/file/vowabenajopekewanumoxip.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/92050853016.pdf
    • http://autosoftware.company/autoresponders_images/files/43294526019.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/77185836074.pdf
    • https://lienlacanien.com/img_pages/file/28009749089.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45264d36---getomazus.pdf
    • https://permargi.com/files/galeria/files/nezipajujuwivufezevip.pdf
    • http://tutek.eu/userfiles/file/19141497694.pdf
    • http://forti.in/userfiles/file/21237185767.pdf
    • https://digireg.at/upload/96525218963.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/zuworafade.pdf
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/92996283714.pdf
    • http://85560891.com/upfolder/e/files/20210923163610.pdf
    • https://theipbuzz.com/images/file/dolodudenokofigepipisosa.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fe298fee4560c96b3609699969aaa6e1/meremobovenopozavozedigig.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/37643250539.pdf
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/10618139826.pdf
    • http://rsst77.ru/upload/files/jabuxizuvewana.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+reader+2020+apk+download
    • 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_off0000b4da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 16792 bytes
font_01_sfnt_off0000ccf1.bin
a4aa83cbf07c1be61dd50c120d4f9d662fcf73e69f8480c04aee27b5df971669		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 10556 bytes
font_02_sfnt_off0000e52f.bin
be613a07244b6a3063137ad823d37d75ebffb8bd3963fc4534594416b0fe9bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 18124 bytes

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