Malicious PDF — malware analysis report

Static analysis result for SHA-256 f791e9d2f75e4241…

MALICIOUS

PDF

69.2 KB Created: 2021-10-10 14:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f79eb467f8f3c1f3c26f8d3eb23901e SHA-1: f01fa54ff49238cbb44b2426e012def5d27b2297 SHA-256: f791e9d2f75e42417548004e0fdfde590a979c64c2d7a097edb0a9dd009cea15
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://x-software.cz/data/file/68141621840.pdf In PDF document text
    • https://dichvuhappyhouse.com/upload/files/kofamomazuwo.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/rakemepakoged.pdfIn PDF document text
    • https://linhan.xelinhan.vn/userfiles/file/54136555832.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/49804065371.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/10669751777.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/vajetadatodi.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nawuratomatos.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/tupexowo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/39868436073.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/jawakopiratebefinota.pdfIn PDF document text
    • http://immodraft.eu/images/architekten_agentur_images_/file/52450414141.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/dawilad.pdfIn PDF document text
    • https://matrixx.lu/images/wemutafuzezedufudedusodi.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20211004_1C6B8836DFCD4E2A.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556b6ed1b7e---kiliwerajiz.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/gcfe60j1bbj7hkcc4ccasjqt8m/78122793372.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/luxitopujetojivejelesoxat.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61068944696.pdfIn PDF document text
    • http://chikatere.com/Upload/files/1833567549.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/nomave.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/30932584631.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/4102411942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=microcontroller+lab+viva+questions+with+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 15132 bytes
SHA-256: 7419972705d18c75d2356f7459d63c3c1ff22760fcc82472afb12ede86fcb3e7
font_01_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 11248 bytes
SHA-256: 22df56cdea97bf8e2b85545570adfd45c9fd227e98fc3b1b51a0449e99c3e030
font_02_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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