Malicious PDF — malware analysis report

Static analysis result for SHA-256 960fcf12da3bd71a…

MALICIOUS

PDF

95.3 KB Created: 2021-09-21 21:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 487fd397cdb47fb24def0740d6ede9b7 SHA-1: fccaa29b8b92d8700e8359dcc14e88b4208da093 SHA-256: 960fcf12da3bd71ac173ddd97d9d358be5d4a6a811feb0d5058d8a4881d14a17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious PDF, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://haruhonpo.com/upload/haruhonpo/files/pevufalom.pdf
    • https://capecoralliving.com/media/file/79173130520.pdf
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/widut.pdf
    • https://xpress2.eu/ckfinder/userfiles/files/68440543108.pdf
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/41082169786.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/04833bef4cdeda089f01742a45e90cc3/gelogixupewu.pdf
    • http://raffaelecavazzoni.com/userfiles/files/85210252973.pdf
    • http://shmgec.com/Uploadfiles/files/54409697371.pdf
    • http://designbeginnings.com/upload/file/duzarezuguwuda.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e3864ddd1a241d39d593527aa0ab930b/99152592359.pdf
    • http://yao-cheng.com/uploadfiles/20210908060816.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210905_7ADE2741563C51F4.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/lidulekun.pdf
    • http://dr-onesrl.com/userfiles/files/32824646179.pdf
    • https://gencshow.com/upload/ckfinder/files/47512803036.pdf
    • https://www.ruchya.com.tw/upload/files/bijoxagepamujufozub.pdf
    • http://reutlinger.pl/userfiles/file/88480583577.pdf
    • http://termocity.by/pics/files/43940470580.pdf
    • https://techlan.pl/files/file/98956703226.pdf
    • http://nktrading.qa/file/files/loxokaxadadijit.pdf
    • http://palaciodelosnavas.com/userfiles/file/89059452420.pdf
    • http://www.anclupnapoli.it/userfiles/file/zewabirejosibo.pdf
    • https://fajanav.com/aym_image/files/tetupezevupoj.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/81802138303.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=simultaneous+equations+with+fractions+questions
    • 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_off00010992.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 16792 bytes
font_01_sfnt_off000121a9.bin
baeec16b99bc8ad03346ffc60d9895e0a6c7dd4c8b7f1845f1ef31923fbb3321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 11008 bytes
font_02_sfnt_off00013b15.bin
c19d9c49c78f6d85c39acc7c9729a274781341168016325f25d50d8e4b8b97a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B15 19800 bytes

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