Malicious PDF — malware analysis report

Static analysis result for SHA-256 495e0c86cc578012…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 10:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 613fc1a017d29d77927a00a7b6ea6f3e SHA-1: 9a494c02bd409e63ada790a3d0b3cf23742a5834 SHA-256: 495e0c86cc578012d2b1b5520bd5a96f2a1fef25703ead919db9ad761d88fc0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, including one that appears to be a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=gta+vice+city+san+andreas+apk+obb+download PDF link annotation
    • https://paron-rebondir.com/uploads/files/feroxexo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7a9ad5d6---mefubafowemajibetiropo.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/12443743088.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/runanodimagosoxaja.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/semonodedazikul.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/99665226947.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/12238632643.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/16830920904.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161426de6f26ff---vizezazoxedimuwutezep.pdfIn PDF document text
    • http://contua.org/userfiles/file/zivezilolofozuje.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/20230037525.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/6701685861.pdfIn PDF document text
    • https://777mto.info/contents/files/tetafefutaluropajiwagodu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/budifuwuvowawowesaliber.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/856160131613878b5d3d5c.pdfIn PDF document text
    • https://promise-land.com/upload/file/71553313442.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/44094501843.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/66385469280.pdfIn PDF document text
    • https://spacio.hk/attachment/file/rutixusozufi.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/besulenatatazarusi.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/wisobak.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/vuzimamujuzija.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In 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_off0000c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 17660 bytes
SHA-256: fb06569cee2ed5c982fff12205f1c4eded985072cc8c60bc5d2ca3d7867e4be0
font_02_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 11044 bytes
SHA-256: 396858bda0ecee54e01afbd69ce0f8ea934b721f391cb7096cf22b411f1e352e

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