Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f40d5d13f73e9a1…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 15:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68a834898499768434c4e0b94a151b52 SHA-1: 6bb2170b740449b9b5aa3f6cd7516ef5aed8eb8e SHA-256: 1f40d5d13f73e9a1774e0063edb0ca1e5bde8a5d951478627de18c37ef4c9b17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this is a tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=mobile+phone+price+in+bd+under+15000 PDF link annotation
    • http://ginzaoakland.com/uploads/files/18486195726.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/xibemagokoforeb.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/989821846.pdfIn PDF document text
    • https://semut73.com/contents/files/13017219761.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/99633888428.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/togodabozivejajexa.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/24834861646.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/79460526455.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/38066696763.pdfIn PDF document text
    • https://unosms.us/userfiles/file/bijigu.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/kusid.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/35176420626.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/58880343992.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15e4cef58---78884573442.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/pukizetaruvugagiwuso.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9bea861c---timubalakasidezav.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/94058989947.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/61240425381.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zuxotusugofotedaji.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/37389869746.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/neminewomot.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_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 19396 bytes
SHA-256: 64919b0649e78507e4bf6fa73e2a6a456e36e11f792be1bdc617187c6eb82625
font_02_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 10724 bytes
SHA-256: 1483d4b3d3a0102b1096732fb70c6244cfc9f7366672d0261ddb37b80461aa4c

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