Malicious PDF — malware analysis report

Static analysis result for SHA-256 a731feb88c341a5d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 00:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b7badf2a4ca092f86a6216a215c76b6 SHA-1: 131abe85b19001bd007472e591803d506f54bff2 SHA-256: a731feb88c341a5d5e6e189955c0518264ad4d5db5993dbffb021870fcfd7f56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The ML classifier also flagged the PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=download+minecraft+1.14+mcpe+monster PDF link annotation
    • http://appli-veolia.net/ckfinder/userfiles/files/90026670574.pdfIn PDF document text
    • https://jetaime-shop.com/files/46205500588.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/40784796208.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/nunifulibewerufurosaderog.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/98954331743.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/basidewokalafawodusow.pdfIn PDF document text
    • https://redac.ch/upload/tevavolelikilix.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/vedagumafikukoxazumomob.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/47654240235.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/votiniliforibupime.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/riladofazu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f578b9ea01---javezomufipusufi.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/88090283145.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/mivikeroj.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/dewogidibifepujazigatas.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/baraxejivudatav.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/dusupe.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30548563769.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/65136075753.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/guwor.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/lubosajibiv.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/domixulozul.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/91276640826.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/rilapozosimotajemufu.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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 18072 bytes
SHA-256: 656e07ccc0421ed2d2fde68807224ab81b9f91598b907b19a4b6522b0a3b5c81
font_01_sfnt_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 11064 bytes
SHA-256: 711457d4a6ddaad419188640ce45ac88fbfc424b4e0d384d16341366fff6c339
font_02_sfnt_off00012b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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