Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5d8c135505ab18…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 07:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 29c184083e9a8df5cc560f9e6fad99ca SHA-1: 81bdbdaf1bd49a062175d83f2ad2ab5899ec1313 SHA-256: dd5d8c135505ab18ffa69577d6b27ea2f233da1e08125f44d9cf4748a7f536ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable and part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://kapelski.pl/userfiles/file/mesitejelapufik.pdf In PDF document text
    • https://happyfun.tw/uploads/files/202109061207313005.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/61008380899.pdfIn PDF document text
    • http://envigest.cz/upload/file/73808271856.pdfIn PDF document text
    • http://maidichike.com/upload/files/9205835485.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/ranedez.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/wupikexifivosivix.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/91005735444.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/burejiwipavurukizinavar.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/66448349211.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146c92955a55---17070757168.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148ae9880e60---85145136311.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/mufomomufewowupewulenixid.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/31494726052.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/darok.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/fisetazi.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/5177770582.pdfIn PDF document text
    • http://deauville.ru/files/file/88871664807.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/3375463144.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/gixulogad.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/21494676451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+block+a+contact+on+your+phonePDF 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_off0000b085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 10872 bytes
SHA-256: 940393a87ebf90c0effd1c862ac9f4845db43202fe507f3aedaf74a65e246455
font_01_sfnt_off0000c971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 16652 bytes
SHA-256: 1124efacb4d7eb78d4fe40d5888b24925a53ed5552a6cd04b2d0b88a497fe4ef

Open this report in the interactive analyzer, or submit your own file for analysis.