Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf628136610d7181…

MALICIOUS

PDF

91.1 KB Created: 2021-10-09 06:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 774dd5e9d777af793c498ab9a18a6f03 SHA-1: c8bf067c9aa793b2cb3f140fe1bdc337e6089841 SHA-256: bf628136610d71813994408a5d1a65613dc6ac8a5d7fd4c87a3161be208a649c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains a large number of embedded URLs, many of which point to disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The embedded URLs suggest an attempt to direct users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://drafthe.ru/uplcv?utm_term=how+to+keep+links+live+in+pdf PDF link annotation
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/xamafofojadazefofuvijig.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/kozer.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/73289352658.pdfIn PDF document text
    • http://vladekoservis.ru/files/mamiviromenofisamataku.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/70210246905.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/midanilekefoda.pdfIn PDF document text
    • http://mylodge-naoshima.com/31327091842.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109160951302534.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/21070128106.pdfIn PDF document text
    • http://sns.hu/_user/file/5117508660.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/butugomovafi.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/12299253609.pdfIn PDF document text
    • http://stattus.com/assets/file/vafusujitirimanu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wukozolodovaf.pdfIn PDF document text
    • http://horvathortho.hu/tmp/45363228699.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/jidebifopunofezaxexow.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/3708434149.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/neliwox.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/18665994630.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/38671135146.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/zafeserobifudupeminenixe.pdfIn PDF document text
    • http://sro52.ru/uploads/files/6904328657.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-10-9/20211009015146566742.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/66715631970.pdfIn PDF document text
    • 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_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 10464 bytes
SHA-256: a21983f3432f701d4ee64bd8b59cf2dc794e557c2f26f944c5fd6ff48e152ae5
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 18928 bytes
SHA-256: a8924f0b55d78ffbea003fa459801bfffff74b6bdcc3bf6c4392d9b402c06f12

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