Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46f4db834fcf07b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-25 19:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48deafea199f46e635e59890d8018aa5 SHA-1: 50bdc68adbe41abedbc17e2167a478dad59aa659 SHA-256: c46f4db834fcf07b8d2a609a74a1210375d6f134b238f9000b496dd8563e3a84
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/97398955096.pdf
    • https://ispartaprefabrik.com/ckfinder/upload/files/gojodimuzizonetaselum.pdf
    • https://maggievanostrand.com/uploads/media/file/kuluxozekefasalanexosa.pdf
    • http://studiogalata.it/userfiles/files/81103775321.pdf
    • http://vasvaripalmuzeum.hu/upload/file/63574773043.pdf
    • http://elpijisystem.com/file/jesikonakekav.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9b7bd1292---87857357048.pdf
    • http://canvangdientu.com/images/file/sepeliwara.pdf
    • http://wadsoda.com/UserFiles/File/53330210746.pdf
    • http://grossbuch.com/upload/file/61624416687.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/sojupazenalumag.pdf
    • https://cochleartudaskozpont.hu/files/gitasama.pdf
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/19504153623.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/59760928695.pdf
    • http://nfraccon.org/userfiles/file/nodajususegagimad.pdf
    • http://mrukseo.pl/userfiles/file/22028261108.pdf
    • http://illinoislivestock.org/userfiles/file/45339318173.pdf
    • http://naturallabs.fr/userfiles/file/57007141276.pdf
    • http://musikpark-live.de/userfiles/file/jubagivubewuninurupomet.pdf
    • https://s-oil.hoakhanh.vn/uploads/image/files/fefugalo.pdf
    • http://plafondchauffant.fr/img/user/file/34078850615.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090603290380554.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/30358589804.pdf
    • http://plenaseguroseprevidencia.com/fotosempresa/files/karatusatovufexibeduvu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=all+dino+pets+adopt+me
    • 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_off0000bf09.bin
743683e4589d625b2db111796fab07b15ec77361f4c470b00afecb036a6ffc5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF09 18212 bytes
font_01_sfnt_off0000ed46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 16792 bytes
font_02_sfnt_off0001055d.bin
be79d7670d1baf00dd7b326d194002cdb49c0ae12ba3fd930234f63ef586699e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10436 bytes

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