Malicious PDF — malware analysis report

Static analysis result for SHA-256 e442c426d881faf6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 13:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc41be672e002672cf0ddecbe7786bf7 SHA-1: dc85b1435a3f9a1faa0ed73d06a69948b8e8aacd SHA-256: e442c426d881faf643ddd80070dffb26cc622d333fb300402dbeb88550e7c1e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through the embedded links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://phuongsen.com/img-chamthi/files/digafedipuvoziwik.pdf
    • http://jjmcp.jp/userfiles/Image/file/nixunikaxeg.pdf
    • https://davidfoleyinc.com/userfiles/file/76476280681.pdf
    • https://yomadesign.com/userfiles/Proj_Name/files/zonukatexi.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb9f3e908---82804708008.pdf
    • http://deeringbayrealestate.com/userfiles/files/9547292606.pdf
    • http://cbcom.fr/ressource/site-image/files/97836974787.pdf
    • http://debeleven.net/UserFiles/File/6200274302.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381c0c848ab---93781566313.pdf
    • http://runhouchem.com/upload/files/19667573456.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/74661257442.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/renejulopodakul.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/30807097497.pdf
    • https://cvsc.co/userfiles/file/wobudedepugojezij.pdf
    • http://urduhadith.org/survey/userfiles/files/50931516283.pdf
    • http://kag.fr/userfiles/file/gurarakagakajexa.pdf
    • https://it-remarketing.pl/app/webroot/media/files/denevamab.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/davaveviduwiretu.pdf
    • https://huangs.tw/uploads/files/202109131611454186.pdf
    • http://orvosvalaszto.hu/uploads/files/dolonenewabogofaror.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/kojubiwonetosubix.pdf
    • https://vroa.pl/chplusfiles/file/74656384418.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=game+steam+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b201.bin
0692c1c138b29457ac177b3106b6251eee15b0c22a2261c7795b544e68cd7c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 17084 bytes
font_01_sfnt_off0000dd99.bin
1ef5e2bab4a7557b2d1281b72fafd60f2f06f424e21ee94ea706a0527b525cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 10400 bytes
font_02_sfnt_off0000f526.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 16792 bytes

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