Malicious PDF — malware analysis report

Static analysis result for SHA-256 532c609b286961f6…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 12:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9028c4ef4cbd9c194651ad1e55a8718 SHA-1: 4806b766a20aee343ac9e16fff469346af2bf263 SHA-256: 532c609b286961f60af0ce4b9bc87c987a0d8bc4c06edc2582d4005520c620ca
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, many of which host PDF files. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://ssekolkata.com/ckfinder/userfiles/files/26007013706.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8006d3fe27f34a6666366e8564f16165/53834623391.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/79563888678.pdf
    • http://sushigonewildtogo.com/uploads/files/sinuwa.pdf
    • http://bestpokeya.com/uploads/files/33378000407.pdf
    • https://foundationkuzmanov.com/files/5343733987.pdf
    • https://pachetedeturism.ro/images/files/43009492303.pdf
    • http://chayka-svg.ru/files/72113585556.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/27458011749.pdf
    • http://ktcyy.com/ckfinder/userfiles/files/kijalaludopaseworute.pdf
    • http://redigonda.it/userfiles/files/fudis.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/ropazufijesasiganedog.pdf
    • http://arisutour.com/ckupload/files/miripesikaziporedewe.pdf
    • http://polimak.pl/userfiles/file/14341895253.pdf
    • https://manuscripthandler.com/userfiles/file/75146111417.pdf
    • http://szentimresiklos.hu/upload/file/gopafomisukebowuxarudumer.pdf
    • https://bonaparte.cappencms.com/templates/files/89643446842.pdf
    • http://adec-interiors.net/Uploads/file/48505642379.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/xuvedomubekafisisekazaso.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab82c091c---wigudubedamuromimuv.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/67111162904.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/24023840122.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=terrarium+apk+2020
    • 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_off0000b068.bin
88cae0b77e959bd376b446acbeda567e43fd8d78483377ebddcc59dae474dc4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 14716 bytes
font_01_sfnt_off0000d599.bin
a3fdd3c0195bed9026394e5584378aaaa65b659506b7a73fca1eb2198be2872a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 10272 bytes
font_02_sfnt_off0000ecc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16792 bytes

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