Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8e877be0f67a2d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 23:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d68b15bcdd1bf980ee778e21b2124fe SHA-1: 7cd52babcc774e34ea6610455a1a5a8d97b16d7a SHA-256: 6d8e877be0f67a2d4a1bb8c2acb61f8f39ca4273751ad38735c86e02339150cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm designed to redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead the user to a compromised or malicious site.

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://www.rarlaw.net/siteuploads/editorimg/file/masagaforomodisij.pdf In PDF document text
    • https://nsaimmigration.com/userfiles/file/63304131464.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/68992659660.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210914_112600.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/15604368659.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d18adc5d3---xugesubilu.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/13921235825.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/38774583595.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/xafesejeligapi.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/sepuzivunobizidotuv.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/rugilusaxosuv.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/53405003779.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/worobadirevud.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/19714192547.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/pulupak.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/bufokojujizagaxonaxa.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/97941669557.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/17157467787.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/32816094639.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/52776732107.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/23954644611.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/18250208063.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/zabomuligosogosif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sync+music+between+android+and+pcPDF 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_off0000b629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB629 11144 bytes
SHA-256: ed07715fbe0e31555c56cfb5bdda08ef64e724a0065fda7481a941ebcf395883
font_01_sfnt_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 17652 bytes
SHA-256: 4bd02a76f7245c79d381cc869a4a9305f7f9b3c4fb4663c84bbcdb9785f05103
font_02_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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