Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7cff2103979d5c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 18:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 296d6790209024e2aaac94dcaa9981bf SHA-1: f3330b8538d449ec6aa788384ad969bfcfefbb63 SHA-256: 9c7cff2103979d5c8eb01ffe2174a6a110428cd6f325fc4301a7576356ca70f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, likely to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the presence of numerous unknown URLs points to a distribution mechanism, potentially involving embedded JavaScript or other exploits within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://editionsitaliques.com/userfiles/file/rubexa.pdf In PDF document text
    • http://eco-building.cz/UserFiles/File/57424326877.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/35489901586.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/gujobital.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/98649585884.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/lomedewixudef.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/68072530541.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hoetnbcoqup18h84b9r6qcror7/31132703590.pdfIn PDF document text
    • http://a-pluset.com/userfiles/46463046928.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021910322406087.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/84704285768.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613523850e8ba---zuzizetebibaruforuzupa.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/49701755780.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109030616164363.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vapawumositozo.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/47370564634.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/dumuxurexuvedovovobivuz.pdfIn PDF document text
    • http://arablift.net/userfiles/file/kapozofirokedivemitome.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/98600261985.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/bivugufa.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/begevilerakiwovaz.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/99006227781.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/67503065599.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/vawurupedibemolapeki.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/tufufus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=google+keyboard+arrow+keysPDF link annotation
    • 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_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 17432 bytes
SHA-256: 220e2184046778fdfe70391c4be6982b049048de9499f1bee9afc666be090d62
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10600 bytes
SHA-256: f143e604c000bb22a8ee1d1ed1a4d804ebed90e8198964ba797e6d89da88be16
font_02_sfnt_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1