Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1205d3b39d2aee…

MALICIOUS

PDF

84.1 KB Created: 2021-10-10 18:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 579839c8e9e85e6f8f640c3129803199 SHA-1: 1c8b59dc641e67bc6d0ecb2cefaf40566e71fe49 SHA-256: ef1205d3b39d2aeebfbb53a125f9db4c60edf4dc363f2abf005f50ccd00d20f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external, potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=silent+hill+credits+song PDF link annotation
    • https://tranhtreo.com/images/ckeditor/files/pefofiluwavevazabapo.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/nitixanof.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/24805119584.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/23597727968.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sowotafusenikinazilufi.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/nemosupurawoxebipipaf.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/41224738011.pdfIn PDF document text
    • http://atya.eu/files/file/18518007359.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/30495601031.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161465ddac46---domisijofomabejetesepej.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/68440428708.pdfIn PDF document text
    • http://floramarble.com/uploads/56112219230.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vuzowumifogizuromuxogosir.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/271982fe7cfb034e053f1a3613e3a207/76764303232.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/63633329053.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/nesokaten.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/36129810374.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/53076184393.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/videbobokikowimi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/sevunedutinel.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jafopagaworaborakadafeder.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_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 18692 bytes
SHA-256: f56f2c3778cc5ff09374eeb170a2708d9db6f95fb3b54ef3f76a380ea12d192c
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 10560 bytes
SHA-256: 83efed927e344a58bb6227a1b5392883c84018ae1dc577a02e30af28c0b787df