Malicious PDF — malware analysis report

Static analysis result for SHA-256 309dcd8be90631ca…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 20:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a64109da6657d490a8e230e5b62f6f0 SHA-1: 211f3acf3f4f05480aca650c52190b469afdb5cb SHA-256: 309dcd8be90631ca59784ad21e795f8b6c6d9f83c8c436098177f1691a1426cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=surprised+by+joy+pdf PDF link annotation
    • https://genegurumiraclehealer.com/userfiles/file/xepati.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/vofawubometedozufitiwa.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/49136918052.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/2991448843.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/44100245201.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/zilejinapomarirugapav.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210907152145.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/worebivepitud.pdfIn PDF document text
    • http://df-2.de/images/daten/file/11926027744.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/4536558905.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/75477505982.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/80439363730.pdfIn PDF document text
    • https://fivetc.net/uploads/files/fasuwimogisekuvevod.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/bugoxemusufupuki.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/zivatorufemoboxiruviluk.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f417599ad8---98970436852.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210914030733546621704.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/45632112167.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/6617098127.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/xitenokipu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/21620677354.pdfIn PDF document text
    • http://hidramaco.com/files/files/62732943801.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/78496085187.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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 10640 bytes
SHA-256: 9e360e80404d915ac1b73565ed518da00fa88d296cf0874cacce3e49cc476c6e
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 17796 bytes
SHA-256: 98312317f8b5e77941c9a1fd1e9df570374d2c6999c21b5f64ffa1afef04838a
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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