Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed021fa87baeed7…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 22:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2a15c587a4e3f3228907cbb45fe3f23 SHA-1: 556bf3a7621441119e0e8557bada74be106281cc SHA-256: 9ed021fa87baeed7883f67da5632d45a825720241a982e637f4142e6feb0db91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=world+history+apps+for+android PDF link annotation
    • http://qianxi.cn/filespath/files/20210907055116.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/82285765668.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/lupadijenu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613112994284a---sutemefepomo.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/wibujufi.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/tajojek.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/sizolisinibeduxi.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/ruwedefatejob.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vuwelod.pdfIn PDF document text
    • http://jump360.co/upload/files/20210907045145.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/87327212506.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/91558467996.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090419321194.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/wavunonuvadotaxobunuraxoz.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/58463309715.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/98875967705.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/62590781223.pdfIn PDF document text
    • http://freeorden.com/media/file/xaxuwiwogotaxiroxobadi.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/peguxefasevobimedetep.pdfIn PDF document text
    • http://dreptultau.hotnews.md/upload/userfiles/files/83162277945.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/monosumenopemoju.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/6291970266.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa6241b66---71107266036.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906030605279.pdfIn PDF document text
    • 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_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 18988 bytes
SHA-256: 3fff64101c443bcd197b927b2fff508a1d746dc686ff8350e4a9c41cc9f348b0
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 10572 bytes
SHA-256: 9db2bd1e8e761d2b368b6a0e57afeb66076fed69ac56cab6f3480c2df1a6294d

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