Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d767121aca8752a…

MALICIOUS

PDF

75.2 KB Created: 2021-10-05 12:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a102df441d122bb606af701f1692113 SHA-1: fe8053cfb223d422bfeb65c1115aaab1ced1b238 SHA-256: 4d767121aca8752ab27c069ee43984e3275f0f85d6dcf42ce01824ce3da987b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 a suspicious domain that appears to be part of a link farm designed to redirect users. The presence of these URLs and the nature of the heuristics suggest the document is intended to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=medical+laboratory+science+board+exam PDF link annotation
    • https://comillaspostgrado.es/userfiles/file/97739173226.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/63366384612.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/wurefururirufiduwopixe.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/56650311758.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/domenevalor.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/33355561671.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/62cb45ab169af6189b05bd10587ef872/4817148553.pdfIn PDF document text
    • https://cicimanis.com/contents/files/22430490832.pdfIn PDF document text
    • https://possamaiferramenta.it/uploads/file/33482113161.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/nuzuzuzamifolizi.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/75391054657.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/44671479847.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/69497120085.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/mexama.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/40037905886.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/turijugipola.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/xuwuz.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/64427170345.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/vifajuvoduginagarapa.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/18176315881.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/guvaponojalutitis.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210925_222151.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/zufit.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_off0000c045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC045 10880 bytes
SHA-256: b1815e8daf6108542d8bcb923f8341408858353d5affa508f96d42c70f748ff2
font_01_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 17384 bytes
SHA-256: 7d000e6cceb5bb37545f03056672ec45e8abd6b85c2f3f79d76583e199ecf63f
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1