Malicious PDF — malware analysis report

Static analysis result for SHA-256 934ec1b246017bb8…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 13:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b695ecccce106b66ebcb93f4a0cc226 SHA-1: b808a95038ca9fc2346fc178de4c13f9fa60756a SHA-256: 934ec1b246017bb8cd5d8942143dd4c90867e06403ad5f69021846031ced4e6d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to unknown or potentially malicious domains. Heuristics indicate it functions as a link farm and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of PDF_URI and EMBEDDED_URL heuristics, along with the ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lenaoyunlar.com/calisma2/files/uploads/mijejimadurevud.pdf In PDF document text
    • http://excitechem.com/userfiles/file/99989376095.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/76196561246.pdfIn PDF document text
    • https://eetravel.net/file/57998745621.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/tobebarezuxemega.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/baruzatilisutubozowa.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/motikasikifapiwegokawo.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/57329894814.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a5f1e252---38315839805.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/74425308415.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/puvedipulekiwulevinisuv.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/99330950393.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/47313609845.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913034354.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/xebugofi.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/xileke.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/navubedonoronin.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/8388242226.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/22766665254.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/jakavupofufimosevajoja.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210916_005110.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/nuseweriwexel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=roblox+face+idPDF 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_off0000b00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00D 10284 bytes
SHA-256: f284a515f8e588402b104ad1d1c9017e081a8cc56a6f7de22af0782d50aa0e5b
font_01_sfnt_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 16764 bytes
SHA-256: 8d40728f23997305352a3a338a0317346aba63332de6bce42e0cbff8aa23158f

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