Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b13ed328070beb9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 04:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb7bc6c68bffa2f2bf8b2bf81de306ae SHA-1: ba2444c853e2e60fc90904b9636ea3bc00819325 SHA-256: 9b13ed328070beb9412fb12407eefd7dd8512e8bef00e726314d9ec9fbdc3c2e
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 PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. One URL explicitly mentions 'teamviewer phone app', indicating a social engineering lure. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c14f97adc---39076751912.pdf In PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/tabitukeregexetixomuwa.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/mavoxuvujategufadeba.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/dodefujenosodubaguvasokum.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/tivoraw.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zopipejozimebapuniz.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/pusukowowinovumez.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/67913825956.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/viwurerurewelo.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/50201200549.pdfIn PDF document text
    • http://jljemc.com/upload/files/xuvojalugekalawawe.pdfIn PDF document text
    • https://tckontrola.hr/files/66072985853.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/77574457431.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/guzafuzupuvuxewo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/435954029f7a7bd438a76691f3e65c09/46028033349.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/97435649152.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/rotuwanozemu.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/zogososexapebovazexiki.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/gupikarawuwiladixuwezowiv.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/18025534140.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/xirusoxadutenap.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/wuxalepanaxedijifikumuli.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312700311197.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/zuzefi.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/58559686744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=teamviewer+phone+appPDF 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 10320 bytes
SHA-256: fe4cdd13299f41f17ea0f47c3c714f9260d735cba887a97f514eab205d8c1355
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 17220 bytes
SHA-256: 454fd7199b85943a6e99bbbe2c87edd1357a2e046e3a94c6c677acbb6f00375b
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1