Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f39e31967209689…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 03:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec0ca81296eaa11d675594deb95736cf SHA-1: 68ab5e8836da4022f5b69d9dbe656b60b3aaa665 SHA-256: 0f39e31967209689c68fef5a3d3be1aaf9c2595f20e331875265fcbf59727913
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 designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious classification, suggesting the document is designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cleversystems.ru/userfiles/file/67584679181.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e30c00b7---720193816.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/75353597212.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/69323235817.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/ribipon.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/72445838444.pdfIn PDF document text
    • http://jucal.es/images/file/77234669008.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/46065489358.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/97494051396.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/27161704773.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/revokakas.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb7b1c045---rerasajomu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1k3v6j8jpj1vppgq8gt37pbjgq/27107374816.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613915aade710---13001362119.pdfIn PDF document text
    • https://dalba.net/other_files/File/selidetizixisodepaber.pdfIn PDF document text
    • https://geloracinta.com/contents/files/lavitasapowojano.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210916171237.pdfIn PDF document text
    • http://smirna.pl/files/file/balanu.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/27833101939.pdfIn PDF document text
    • http://calisnt.com/uploads/files/widegarevezululux.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/10047392574.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/54439141861.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/65818830093.pdfIn PDF document text
    • http://baove24h.info/upload/files/27384267280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+nfs+world+offlinePDF 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 17464 bytes
SHA-256: 3cfb5065d0ec3831fb19f4048d8111fa45ffdbd7bb784a12418e07252e90533b
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 10336 bytes
SHA-256: 368c88aaca67b327e4e22e384422596d8ebb3f871d4096cd395c61c646dd13d9

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