Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe48bcbfe4dced6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 12:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a34f8702bed95c7faa819cd5171ca21a SHA-1: 54c5108dfb3d854d49ccf6b234d348d0582ece94 SHA-256: 4fe48bcbfe4dced6ee812885c6c514811070142bf2bd7a32493d14ea87cc7792
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=do+i+need+antivirus+on+android+phone PDF link annotation
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vetaroduvusowibuloweru.pdfIn PDF document text
    • http://art-ball.net/files/file/jumuzabuzel.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/tarojuluw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/salap.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/koniwebavewuduxasadapikur.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/62286876455.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/23427738603.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebce0eefe---95582849297.pdfIn PDF document text
    • http://besteva.com/upload/files/23278800355.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/76512302334.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/vufideg.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/finifowubabumoxo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ee732b8d---20728172628.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/83003369654.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/ronoredetigegopejemufet.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/zisuzok.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/55695404495.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fa957ece---kilukuro.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vexuwenaripoxuvanur.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/60094671144.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/kixusifewin.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/pilevuzezofupegiwujogub.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 18056 bytes
SHA-256: 8fc21d36d6e7766aca11d44c02386a8ad34d6f8f819fdb838967e314d2f1f5c0
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 10612 bytes
SHA-256: 6721e1cdf39c8cf4e6696b4e19edb7f66331b9f1afc3d4b0468babe3bd57efe0

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