Malicious PDF — malware analysis report

Static analysis result for SHA-256 feeefb592fcd4a4f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 00:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53b6a1ad597118ad1a3d5fe39e4685ec SHA-1: 36579ccf6ebaadefbcb2950e7f5af28a54b86cc2 SHA-256: feeefb592fcd4a4f46a08713210f604af26392d6fde60b79ba1ee06e67168afd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to a large number of distinct PDF files hosted on various domains, suggesting a coordinated effort to distribute content or redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://studiobaldizzone.com/userfiles/files/powegubowosanevanis.pdf In PDF document text
    • http://dominoliberec.eu/images/file/files/91944920216.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/97880098578.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/46509503445.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/10129046411.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/zukejixogavilora.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/xofik.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/pejeremopewozatavedamo.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/fusawudabogarixedizusugix.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/88465621987.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/rukagoxuposivoretug.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/sorib.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/vebisiruvorajujudaroz.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/48679253874.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/kewejosizimukog.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/36165260721.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/45d7d9c78ed163e6db77fa49fe15e69a/38558874309.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/gibunesagizeka.pdfIn PDF document text
    • http://sin-hua.org/userfiles/57874879416.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/80928496982.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/50466216918.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/sowejusakal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=file+resident+evil+4+ppssppPDF 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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 10224 bytes
SHA-256: ad7e2fb0066067ec79e0b30db1eb774678eab77610f63fc44af00504d6eebc7d
font_01_sfnt_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 16788 bytes
SHA-256: 116b7d02bfc67e5c8591aa3c722efb87e5593f70ed2e5acb0649177fb52d6b8b

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