Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2222e5c7869fdd…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 09:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08350ca291fdcfe308223313b9a26e2a SHA-1: b2c33687c99ad94440442a528de46b5ab488a4c0 SHA-256: 8f2222e5c7869fdd8c8e930c14e7c10ad28bdc1e56e6de27d7e60a9cea6e5e4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a potential attempt to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wwsm-us.com/files/file/79959203732.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/zexafajul.pdf
    • http://rustproofingottawa.com/userfiles/file/65876954834.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/19406933281.pdf
    • http://www.galiantsolutions.com/emailimages/file/zojafezifapa.pdf
    • https://springkasteelhuren.be/userfiles/file/22687284372.pdf
    • https://home-consult.lu/userfiles/files/14614040102.pdf
    • http://studiochiodo.eu/userfiles/files/xawotabomare.pdf
    • http://jyjjapan.jp/files/ckeditor/files/mojazagumebep.pdf
    • http://vkp.ru/upload/global/file/2122906021.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/wapuzelobulo.pdf
    • http://holland-ex.com/images/blog/file/53540348708.pdf
    • http://edilcfcostruzioni.com/userfiles/files/sukabozowedevesazu.pdf
    • https://otterdisplay.com/userfiles/file/56066448354.pdf
    • https://markaoyun.com/calisma2/files/uploads/20896090579.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d5ab2c20---fibutafalibetejawozitit.pdf
    • http://s-privod.ru/userfiles/file/82343390907.pdf
    • https://doublehair.center/upload/ckfinder/files/rubugowarulo.pdf
    • https://abzesolar.com/uploads/files/fifogajimizedekelex.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/27743355161.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+emulator+on+pc
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/76607438779.pdf
    • 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_off0000f400.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 16792 bytes
font_01_sfnt_off00010c12.bin
b17dec06404994e76bc0347c41f37cfa41a7ce2cea89d31eaf6340ed464a36aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 17536 bytes
font_02_sfnt_off0001392e.bin
adf64bebd0829398ad7d64a17dce72f0a580f57faca5c3e6c84efcaa30c1e21d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1392E 10448 bytes

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