Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d004f81191b391…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 09:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b785c534e15f919d67826ba5d3e376f SHA-1: c11c53adf11499bd84dfa831a285dd7fc86d025f SHA-256: 27d004f81191b391a7d7966a061aec5881aac7bd688192df9c2aa94078a1c2c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. ClamAV detection and ML classification further support the malicious verdict. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=android+change+email+server+settings PDF link annotation
    • http://punaide.com/userfiles/files/xiralago.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140580b5fe55---mesek.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e365c65ad---zasufapeg.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/wutasifusojutevilakotewe.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/68282548931.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/tijawe.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631242288jatufepapufivirusebex.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/juriv.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/54098107413.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/movuxasajuvololisuwizirab.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/30599792864.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631963471.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/wogusibadurekodotonubin.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/dijofu.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/35183498370.pdfIn PDF document text
    • https://ms01bet.net/contents/files/debipumebenekavujosijix.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/526484667.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/60048439175.pdfIn PDF document text
    • http://teifsepahan.com/files/file/bumugaz.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/nusoxajafizumexowi.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/jutixaxegujigagi.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/83094551388.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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 18260 bytes
SHA-256: 77a09714405bb03f6a1c6d268891edce31911c86479cea649d14c88c60444a83
font_01_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 10864 bytes
SHA-256: 2f292ae061b6f10d23218e5ddf134711efe02b707874c860183e01f647b7cd33
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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