Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f85b658c970fca…

MALICIOUS

PDF

73.8 KB Created: 2021-09-29 00:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d67aacb70ad23b8fe0c769798a40ce7 SHA-1: 8893f7903c68a9cd417debc6a0e9e3daf2ca43a6 SHA-256: c4f85b658c970fca98170e74ca01dce52878cc79f265020d96ec25cc22dbb30f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'crewmak.ru' and another to 'hotel-ambassador-nice.com', suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a deliberate structure for distributing links across disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crewmak.ru/uplcv?utm_term=scary+teacher+3d+app+download PDF link annotation
    • http://hotel-ambassador-nice.com/upload/files/35822930812.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/gogitatobanokatepol.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/vajixewixorokozazaliwo.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/kesozazorug.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/33385265992.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0f70a0b07---46126453369.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/19068724432.pdfIn PDF document text
    • http://akcco.com/userData/board/file/99044808230.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/35543392288.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/ranosifobujabufajivat.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/6078119223.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/gunaz.pdfIn PDF document text
    • http://kasand.com/userfiles/simelimena.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/51859105348.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/duzolime.pdfIn PDF document text
    • http://bluebossa.pl/files/file/13383500188.pdfIn PDF document text
    • https://hse.tw/upload/file/57656016355.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/60345914437.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/78057995073.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/77083111963.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kifalukazegotad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56F 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 14620 bytes
SHA-256: 2e55f746f71f1ab53be614efdaadfbb8a9b069ee5140ecd5aa54f4b1b4fd374e
font_03_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10796 bytes
SHA-256: 15eaff5f0b1feaea9c30c971518125e23ae7eca607830ead8f6a1eb6bece4e8b

Open this report in the interactive analyzer, or submit your own file for analysis.