Malicious PDF — malware analysis report

Static analysis result for SHA-256 0373b2b0a188b84e…

MALICIOUS

PDF

84.6 KB Created: 2021-10-08 11:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9235c955604248ed3aaedfdba5ea1eb2 SHA-1: 951888e0b0d8ba474a87c1b8ff002ac286076726 SHA-256: 0373b2b0a188b84e7f1cb69c36559ff623c028d2b790db99839ab8424b5a681f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URLs, many of which are embedded within the PDF structure, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, common in phishing campaigns. While no scripts were explicitly extracted, the PDF structure itself can contain JavaScript for malicious actions, and the presence of external links points towards an intent to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=rewrite+the+sentences+with+different+intensifiers+and+adjectives PDF link annotation
    • http://atel-j.nl/uploads/files/2481362999.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/zifena.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/matiwa.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614baec9c232d---ritotinajit.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/51058663534.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/vufimot.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/80765428974.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/28567729159.pdfIn PDF document text
    • https://fasaac.org/temp/files/20440552601.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tadepipi.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/jomewimotifeba.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/puruzarepuzunobiferixa.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/39181913829.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/37749855556.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f10249f4f85435d8e54d8726b06aae29/51446428212.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/18303812448.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/92573185806.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/95546509013.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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 10732 bytes
SHA-256: db9931cc686c12ea2544f209498f6a2fd80bab74f6939bbad7607570f510777e
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 19176 bytes
SHA-256: f8abf462835b58b1b139e16332587b8c32dc212c058ea3e6e1319d1297ad0903

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