Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dd285cb0b273f4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 23:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdfc3819417a8ec21e8d18935e65645c SHA-1: 035e1b777f9317b43a482de0a02cd5e82727b5bb SHA-256: f4dd285cb0b273f435ef6d928e5758fb60e7ab35e415688db2f3722476578b2f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a QR code lure, combined with numerous embedded links to potentially disposable domains, strongly suggests a phishing or malware distribution scheme. The document body was unreadable, but the heuristics point to a QR code redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://packturf.fr/files/gidik.pdf In PDF document text
    • http://icmasistemas.com/userfiles/files/rudawodegonipewasu.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/67454688425.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/49895998175.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/nuseweriwexel.pdfIn PDF document text
    • http://labotinnghia.com/img/files/78206403495.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109040346307411.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/58283335892.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/mobonuwovutezuvawe.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/71204690694.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/71527621619.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/99795653982.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb04d4eb1e---88712382117.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lurebadijedaxesiperus.pdfIn PDF document text
    • https://dfkcnc.shopper-store.net/file/files/zajikabosubazuja.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/pajeru.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/1010818979.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vexeseje.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/lutot.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/22820798085.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/31456845918.pdfIn PDF document text
    • https://edgecs.com/documents/rutaju.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/2319270392.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/53721619458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ios+read+qr+codePDF 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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 17112 bytes
SHA-256: 5833419ebe607ec726214d3681efdb9a0f854f2a923648b77f72cbf016061031
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 10120 bytes
SHA-256: 8f30c7203480b5d48b2b277ef4f62543d78904e06345cd1e6a71d17a046b7dbf