Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3ccd4c0e716a11…

MALICIOUS

PDF

111.8 KB Created: 2021-09-14 12:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbd3e0f379cb830bd39d978c2d7529c7 SHA-1: 8835340bd28574a91c68039e2f1347d9a2c3a7d2 SHA-256: 9c3ccd4c0e716a11a93624338a3cf54d66770df4bbb758649531ba37b07a2a19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URIs pointing to disposable hosting. The PDF document contains embedded URLs that likely lead to phishing or malware download sites. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=how+to+update+my+phone+to+android+11 PDF link annotation
    • http://micdelhi.in/userfiles/file/93071720580.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/35561526364.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/bunewebiripasudegepupal.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/44872299218.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/kegefelizozinujowofel.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/248902b5c749a5aa5bfdbedcd8783316/53066161701.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/89227334679.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/bipejejuwabavilexom.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/20539134907.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/73223238176.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/46074448988.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/4819039310.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/gutunotujemineseva.pdfIn PDF document text
    • http://gardatrans.com/content/Files/letuxidewopija.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/fezogexutomupox.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090418273852.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/23053870979.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/serapav.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/tifonejejasogadasagajejux.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/fodamisobiwoditeloxuwi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d337a32108---40203711634.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/48092630440.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_off00014e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E97 10788 bytes
SHA-256: 1c0bde10069bdbca81f080cf0ec96ef2308a6f842c0dd1cf9f682e79a35ddd3a
font_01_sfnt_off00016744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16744 19108 bytes
SHA-256: 7f52b721f79a940ee5271fbbc70fd0e08c716ab3f0e0153c81634f3f64f18599
font_02_sfnt_off00019970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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