Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f3e9b381ef7387…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 15:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c52072dcf5c19127c04b1e050da0aa3c SHA-1: d72cceda27323f9190cf42c3289acb20b4f7173d SHA-256: 64f3e9b381ef7387a8941c60d22e679df64ec3edd711f848d39137d51d2d683f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is hosted on disposable infrastructure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://termocity.by/pics/files/93504070997.pdf In PDF document text
    • https://motiwalainstitutes.org/userfiles/file/16358175421.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/fajifos.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/94056103465.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161358f991a16f---77935195065.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/49668724413.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/42373871432.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/3798451430.pdfIn PDF document text
    • http://inica.org/files/file///werama.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/84970575502.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/govetolo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141594ddcb58---98973702239.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/kagedunezebita.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/pumixexutipegefuvowefe.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/81899058807.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/49287573462.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/lixoripulag.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091708250160.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d953af6620023059af03e44142dcbfe6/57054343963.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/pobibalawojinati.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/8383183636.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/74157301467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=music+player+for+android+11PDF 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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10776 bytes
SHA-256: 016d4aa00045f87dde10b47eeeec83ccff558c0a08c8265dd5e215c149c2cea3
font_02_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 17984 bytes
SHA-256: 8de4e3174947f806562af5a8fc92cd107a64076e1397d0d87ae582a382a13bf6

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