Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c418040f8db56b6…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 23:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 588400f6d5d153dc472fe94f450149f4 SHA-1: cfd7dbe529283bd0cfbc369fb3a32be9d6acb6e3 SHA-256: 0c418040f8db56b6a6e90cb08032175356ca88cb10c02b20a335d70a50696699
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aczv.fr/userfiles/file/rukatidopuvipojuwenepel.pdf In PDF document text
    • http://1544-7419.net/upload/fckeditor/file/lewelavuboroze.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/xafoz.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/zotozuma.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/gatonebolipuj.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/fenubulalesupi.pdfIn PDF document text
    • http://le383.com/uploads/files/71394806424.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/fidiwujuw.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/32847333560.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/losoguf.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210917085210.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/tuwobunifapegarizokoto.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/fumafasizidedenexakifa.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/belamiwatos.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/34318039455.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/56498421204.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/13866463398.pdfIn PDF document text
    • http://precisao.org/files/files/tidulukarivoparuwi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210911152710.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/78385054139.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/h27o7lrletclpspqn2u3liece9/xoronupixeduxakixekaxe.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/88607023865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=usb+internet+sharing+windows+10PDF link annotation
    • 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_off0000b07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07B 15196 bytes
SHA-256: a350675d6f0f1c43b5a92c78723f5b4d9a42fd5d39bac254f9d2e93fe198d667
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10888 bytes
SHA-256: 563a03512748ec20541cdebc8c4362e79429d162422e5fd3906650a89f7426b4