Malicious PDF — malware analysis report

Static analysis result for SHA-256 697cd75e3f0af5f1…

MALICIOUS

PDF

96.8 KB Created: 2021-09-12 18:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1683d81ee96dbec271aa093e367ff6a SHA-1: 0d2d89c6e9e78b3297e0508a49950f39eb05943c SHA-256: 697cd75e3f0af5f11d26f564163126230e08d9022ac30f156292851a81a93ffc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish users. The presence of many unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://aokisuper.com/ckfinder/userfiles/files/24328800415.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae9038f4de---nofapuwopozipekasopa.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/jagupudurofotemodo.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/39460394383.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/dixipunuvugumetobamedipi.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/11741895953.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/25040720620.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/19875463276.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/79145082556.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/31907983977.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/sepukubibarikiperibe.pdfIn PDF document text
    • http://rayer.cn/d/files/vujisometolanolimewaji.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109081656159839.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/1400090386.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/femelile.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/17776634760.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/razidoje.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/22098565918.pdfIn PDF document text
    • http://sayarbobinaj.com/file/11915195446.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/3375463144.pdfIn PDF document text
    • http://standdominica.org/files/files/5856083540.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/65445829574.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/68704646392.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/61006964902.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/88188681412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kratos+god+of+war+ascensionPDF 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_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 17756 bytes
SHA-256: 3b7d4106507651f1ca5fa281842b2f06bb6f1c29ec95ea18fd16c12bfd86cc84
font_01_sfnt_off000144f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D07 10684 bytes
SHA-256: 30f79810d15fb1eee7cdaa1067c960698303e8436b1b3f930f7e7ae97871d4bb