Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f28def3666458fd…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 23:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95e8fa019c5a5094ef0df24baca8c225 SHA-1: 216131695d1483e66d4857b275bd822310768e72 SHA-256: 8f28def3666458fd4ec7a2558e1cfa3230d4b0e57fedf1051d994aca70ee82e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a high number of external URIs pointing to disposable domains, indicative of a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://nbnjl.com/userfiles/files/47264610156.pdf
    • http://gyn-ordi.at/myPix/file/jojeburenesojosos.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e26a9a1349---mapofiwasasiwilu.pdf
    • https://numen-wow.com/userfiles/cloud/files/bonisovemugalezimol.pdf
    • http://aburobocon2019.mnb.mn/uploads/files/55882351419.pdf
    • http://pevak.info/UserFiles/File/62414568775.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/sabute.pdf
    • http://designbeginnings.com/upload/file/tefekanugawi.pdf
    • http://otczenacts.com/media/files/mukine.pdf
    • http://alajwakh.com/uploaded_files/userfiles/files/31755090567.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/gukojofetorinopasidot.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/55e39d117650e3e591753bcf656367be/vodonowipefugojejar.pdf
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/sujifabewot.pdf
    • http://jgweld18.com/UploadFile/file/20210902153752834.pdf
    • https://zhbiotech.com/CKEdit/upload/files/19549668159.pdf
    • http://www.beautyvogue.ch/Files/file/takabarebuxos.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/vaforubi.pdf
    • http://dotykbylinky.sk/_subory/subory/sumigigexazarejin.pdf
    • https://cambodiadriverservice.com/userfiles/file/27943655298.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/6843465216.pdf
    • https://grandiosieventinuziali.it/filesUploads/file/56906347609.pdf
    • http://humanlitech.com/files/files/gijaxodemujimomeder.pdf
    • https://rawoctane.com/uploads/file/xevepek.pdf
    • https://prevodi-plovdiv.com/userfiles/file/35208815062.pdf
    • http://polishingmarblefloor.it/userfiles/files/53770209524.pdf
    • http://contrast.no/ckfinder/userfiles/files/92623999228.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+get+to+my+sd+card+on+my+phone
    • 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_off0000c5e5.bin
2550d4cc793bbc6b1c3d88ee6e57799493cdf594dbe2f4d45c9142bcfad7b7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 16772 bytes
font_01_sfnt_off0000f0fb.bin
ccb87cadb4120ed56265b6d58e752c17f4743b03aa7a2b700d6e60f62eb7a54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 11104 bytes
font_02_sfnt_off00010a87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16792 bytes

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