Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2e1e77aed4e099…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 23:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af5c0b6127e9f63565ab0541984b9f15 SHA-1: f2ddfdc04b603f44aa15a4a24396882073996ac5 SHA-256: 0c2e1e77aed4e0998e189fbce75c8edd4c5e88a7900c0135142a30ff3b503727
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://huntic.ru/uplcv?utm_term=french+alphabet+and+numbers PDF link annotation
    • http://blueleaves.ru/userfiles/file/37107674524.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/rowufetuzalasowuva.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/70919427857.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/zisev.pdfIn PDF document text
    • http://pmke.cz/pictures/files/19101239298.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/jegonizezirigexobelamewo.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/bodirajuluvekowo.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/53839566767.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148dff5c9663---79448486390.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/41040245743.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/25057570371.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/15523710329.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95977743313.pdfIn PDF document text
    • https://thepainter.asia/upload/files/66661343754.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/16772644320.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/22491743443.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/12816004159.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/tamajupisumiwurekimoluzi.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/94278568185.pdfIn PDF document text
    • https://ptogel2.com/contents/files/61097382100.pdfIn PDF document text
    • http://allergyc.news-read.com/upload/files/2128256624.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/wetubefesawifokivedulabu.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/pilevuzezofupegiwujogub.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/40dc58684360c5995f7c5585c3ace09e/6440148449.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109251007088787.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://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_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 10784 bytes
SHA-256: 53d29ed548722e1ffc5d6932773cc4263574dc64a7329481681a494f51bff2af
font_01_sfnt_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 15404 bytes
SHA-256: 62925a2661a9a66e214cd30ec54e39a77e85e763e6fab850d9647e6895c58470
font_02_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1