Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c690bd3d4c5afe…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 20:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bd0d30be73bd62a17d60a2b852dad6e SHA-1: 32a0b1c1449022e05f0d6d1e25502ebab8477d7e SHA-256: c3c690bd3d4c5afe5444bd7b892fe75a78b4d6a644cfa65f63092b1a4c35779d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple unknown reputation URLs were extracted, suggesting a phishing or malware distribution attempt. The PDF structure and numerous links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://top1np.com/ckfinder/userfiles/files/vusidumejogor.pdf In PDF document text
    • https://hbfilm.ca/resimler/files/folugovijedubovapevo.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/17660472217.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/domoreritom.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/56804726254.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/wasutil.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b864979862---37151482042.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/ledadid.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/riluz.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/veronananebijogulok.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/gujerixugagamexusovetuver.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/giwisizoletogof.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kivukovinikesera.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/purisudonogorepivozafes.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/gonalabamarupatumosila.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/zozineviwizileranaxuluti.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/56420471625.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///96720630292.pdfIn PDF document text
    • http://balone.net/_upload/file///82558552978.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/68255946568.pdfIn PDF document text
    • http://baove247.org/upload/files/nikovamatawatez.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/88247424882.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/60791506396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cool+math+games+fireboy+and+watergirl+ice+templePDF 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_off0000c3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 17468 bytes
SHA-256: 9c839074db53b1a965440d9512d85b34fe5cdcc5355488030f4e4b9cf4a4241d
font_02_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 11440 bytes
SHA-256: 4d2e60a57becb67b3ae76f20689cfc40f47c4c17d7473695f610ec7facd6569c

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