Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed644943a6a9094…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 09:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f57c962a59e2578a236be142cfe7d7b3 SHA-1: d98ffedc5dbcb2b68746c9463482276c5b6b6f12 SHA-256: fed644943a6a90947917a44b11734106fc50e2c2a4d2be9a69b3bf7428c75172
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on low-reputation domains, a common tactic for SEO manipulation or distributing malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a potential for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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://chcial.ru/uplcv?utm_term=full+movie+queen+of+hearts+online+free PDF link annotation
    • http://chineseclothingonline.net/File/12709686215.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/122539645.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pilisas.pdfIn PDF document text
    • http://abnicum.com/files/file/wiworerarumabexanetumofa.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/zavibalipeboposuzobokewe.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/20278769551.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/nelejuxawuxurova.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///23733083126.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/vasuxeda.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/55354214743.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/25539608540.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/vamowazekopejupofobu.pdfIn PDF document text
    • http://abwessex.com/uploads/files/66236245012.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87321068345.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/59770080966.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/54162755730.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d668077d3---navex.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vojufunixukafufefiniguvup.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/womadozobixatodad.pdfIn PDF document text
    • http://secretinvitation.net/images/files/47472262935.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/55686530260.pdfIn PDF document text
    • https://egca.fr/userfiles/file/pedobiruxori.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/96884210499.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/juxowenaxazaxidikupeke.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/lizitigunilowemojijavete.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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 17848 bytes
SHA-256: 078dcc05390cb491cc9380f97ef549925bdfbdeb0663dbadad268a89044761e2
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 10768 bytes
SHA-256: e8a1d4698c94bb0c7acc6675e4e0aec5270c6939095f36e0915c6a417efcee6c
font_02_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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