Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee89d8f382cca78…

MALICIOUS

PDF

76.8 KB Created: 2021-09-08 20:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f1db0a61d01b60f76aedd53c8173f1f SHA-1: 94fe1c7014bb0405d5ef43fc4a944539ea18b422 SHA-256: dee89d8f382cca7817c477e6af86385f065f5df2b01aa23b15e985b26e0741d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest an attempt to redirect the user 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 https://oniceh.ru/uplcv?utm_term=lotos+plasma+cutter+ltp5000d+manual PDF link annotation
    • http://kunbot.com/upload/files/90470138294.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/sotafikejapafepidolo.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/vufamemalazolazirilap.pdfIn PDF document text
    • http://envigest.cz/upload/file/jalotewopafetebuwap.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109050702319822.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28776750094.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/buxusomedotikofawugober.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902055016.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/tagav.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/55018607953.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/39881280645.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/52483591185.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/munezoxuwo.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/32188550737.pdfIn PDF document text
    • https://svltv.in/userfiles/files/40136908652.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/sitevimabaleramalomepena.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/52942884228.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/66952196787.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/dawufut.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/femipogopu.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/3696565883.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304abf04bbb---29755997055.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/91139252052.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d201dfae---dupejoki.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_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 17524 bytes
SHA-256: 03c38968b6ff7c1b821ae6b2aefe34aaad5bfe8e6a49b8a60dfd6c37265086b8
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 10896 bytes
SHA-256: 7b4a849548da928c9f70f3e965fe9c2066ccdfd7da2a215f958ebb43bd6e47ea