Malicious PDF — malware analysis report

Static analysis result for SHA-256 76522afc941029a5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-10 10:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47a3623651f675a512559e8701a3c7e1 SHA-1: a425ccfc27bcc8a47067c9cc8d4bbd6bc2515ea5 SHA-256: 76522afc941029a545d20f0a7069f5e834d88c866c24a45e4babd75e85f56c13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://infrive.ru/uplcv?utm_term=android+es+libre+o+comercial PDF link annotation
    • http://hodori247.com/uploads/files/zufedofi.pdfIn PDF document text
    • http://ore-processing.ru/d/files/39205075412.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/vugerobatasokemi.pdfIn PDF document text
    • https://senegal4d.com/contents/files/panivuj.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/35186227621.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/23765656925.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/91655545198.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/37279508677.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/93259319071.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/fofipipuduweb.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/sezagizukamokotori.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7837969423.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/50072264390.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/43641146025.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/52812205734.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_044638.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/vamarawazefagogemo.pdfIn PDF document text
    • https://ottopianos.nl/files/nutimiwinofixebata.pdfIn PDF document text
    • http://www.milestonesmn.org/ckfinder/userfiles/files/memitabijofuxidaxovigewi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131930ace678---44245556994.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/48764388606.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/71128187911.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/lurimabo.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_off0000b42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42B 10552 bytes
SHA-256: e5e935613b41718d83674655b7c4a6606e334a8eb27e6bcbea7a0fbf63598cff
font_01_sfnt_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 15648 bytes
SHA-256: 03188c9ccc32ee2e0933ce25dd667606bb6dd7de0b3776b5945b61ea8c6ae63a
font_02_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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