Malicious PDF — malware analysis report

Static analysis result for SHA-256 6682ec6f98bd26a1…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 21:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53aa3878b2ba8ec5bef9cebcce5dc075 SHA-1: e007394f415732708a52dbd99e4e5c782a513d3c SHA-256: 6682ec6f98bd26a1ba08af8d6c678ea44bafea975d80742b40d2f8a6ca5da664
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=unlimited+mobile+legends PDF link annotation
    • https://vitanov.rs/files/puwazuropuzusebi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/mituzedusuromolewobu.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/30583956214.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///nokedefeti.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/29965459982.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/lekelaxoperezigaduw.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/12126225242.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/67993906568.pdfIn PDF document text
    • http://skene.es/userfiles/file/moxujovuni.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/53427365727.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce88249df---fezavepadodunaleva.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/19841030392.pdfIn PDF document text
    • http://rhondachem.com/d/files/94947075869.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/memuvivi.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/23594791401.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/92820507119.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/99370320805.pdfIn PDF document text
    • http://gekon.net/userfiles/file/74476902380.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kupimufofudixalatun.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/weginijelerokukatarajogu.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/98613792115.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/zofaxamu.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/zugazupi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vuwataviduxomajuxudimon.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_off0000bcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDA 10476 bytes
SHA-256: cb38bc9e68449af446aa6a76617c2550509f80556c01a69ce6bdeeb0543338e9
font_01_sfnt_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 16708 bytes
SHA-256: 1bcc40e3bb3b36d688607eb44d1ff3396d927161d17ab6d8204354716b2c896f
font_02_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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