Malicious PDF — malware analysis report

Static analysis result for SHA-256 275f6b2cebcf2e4b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 10:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4168a8647167a82185241ec17f27572 SHA-1: 310d5bf9a92c692808ff20709e21e9bfce551d36 SHA-256: 275f6b2cebcf2e4b137c40fd6ae7cd22777af1488223fffdaa942e7accdac000
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary function seems to be redirecting users to potentially malicious external sites, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sahrugs.com/userfiles/file/79010965642.pdf In PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/43126325411.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/63567442757.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/80176340440.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/sexetopuwabap.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/tadodotugu.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/26163023533.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/pabiladofe.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/sebufobibebibofubekasi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130404c754f2---xitexejarufobironawese.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/8666196575.pdfIn PDF document text
    • https://123natura.com/stockages/files/78232119556.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gejoxafixusixeluziburaxi.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/dakamijunalak.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/30915488592.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dagumowagum.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/32222358479.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/58434672642.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/80963380573.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zibuwisinugo.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/rimaf.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/tonimelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=csr2+racing+cheatsPDF 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_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 18520 bytes
SHA-256: b8fd37d17f5339b9dd40327176ad37421ba585549eb1cd5acabd36750ce74c37
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 10496 bytes
SHA-256: dea53186147089c5d21717c79eab03940d73ed4047972feb9dd8c9c34746fe82
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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