Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f156965a2f8f03e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 02:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ee24d7d184e2f655aaf437997ee5e828 SHA-1: b38175c71bbd778cec77a53ac6c796d0016cc38e SHA-256: 0f156965a2f8f03eccf120d1cee833ac98b3da6beb457215dc5c8cd5744982dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a deceptive link structure. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://av-jet.ru/userfiles/file/betot.pdf In PDF document text
    • https://abcoegypt.com/userfiles/files/petaromagufuvagovedipim.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m3ol5qgm5qrpdim8jf10p6s124/gegow.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/84237774370.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/purapajomebesesedadawevo.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091120303373499.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/desozukamimo.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/28723550172.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/69556894612.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/wolumuzizepaveni.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/16654506450.pdfIn PDF document text
    • http://novafish.it/userfiles/files/wamozigubisonili.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/durulazuxedudamirok.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/6137702465.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/wewigabebujupovav.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/wixesivu.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/63317772901.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pibalaxomopefek.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/98054378327.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614672ad41ea3---65282416190.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/40031441833.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bakuzubobuwadunewa.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109031210586578.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/73543055622.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/xegubokolurisupuwesekiziz.pdfIn PDF document text
    • http://someteme.com/archivos/_20210910024337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=a+major+scale+guitar+tabPDF 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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 18500 bytes
SHA-256: 1a5d4c4cfa54995f2527435e2627daf35c369fd487f4267f2f61fec0971aff9f
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 10820 bytes
SHA-256: 45d450fb725a5db78a9856c6e22eff7aebf31d8921fcfb116439c0d2bf22534b