Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad4adf47829d7d4…

MALICIOUS

PDF

75.8 KB Created: 2021-05-03 20:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11828be19aaab35ac1b2bfa427b5e068 SHA-1: 72e63d4243df94cd20b1d6f54eeaf4655162d60f SHA-256: bad4adf47829d7d4773824d575ce64ff5273a4033d5944062fcc6ba02e868022
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'kuzutuzo.ru/strik' which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to 'dosage calculations practice questions pdf', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=dosage+calculations+practice+questions+pdf
    • https://cdn.sqhk.co/kasuwajavi/mjheYjf/funozovefiwixezobituto.pdf
    • https://cdn.sqhk.co/gujurolekuma/gjA1gep/alone_pics_for_whatsapp_dp.pdf
    • http://rufemonavubut.22web.org/4068629674.pdf
    • http://belegowu.iblogger.org/25539255980.pdf
    • http://ruvinowuge.scienceontheweb.net/bulgaros_de_leche_beneficios.pdf
    • https://cdn.sqhk.co/xurajalijok/bFlzdzY/pc_simulator_android_15.pdf
    • https://cdn.sqhk.co/dilizilozok/jjiJrh8/10402943156.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pewebopufupe/calorimetry_lab_report_conclusion.pdf
    • http://wakodojulugorez.epizy.com/what_is_eutectic_eutectoid_and_peritectic.pdf
    • https://s3.amazonaws.com/jazofi/what_is_the_average_cost_of_a_dachshund.pdf
    • http://xunepesefosog.rf.gd/homelite_electric_chainsaw_parts.pdf
    • http://jimulopipuxofom.rf.gd/rorajaxepuxetikajerif.pdf
    • http://zekezixurul.onlinewebshop.net/46200935825.pdf
    • http://sewewixa.epizy.com/xotigo.pdf
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_9df5c94e1f874c509f9ab7c5b5f6076f.pdf?index=true
    • http://misanedajog.myartsonline.com/14268225712.pdf
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_31b1719dcb524331a05837612d24dd56.pdf?index=true
    • http://gamadajizi.rf.gd/17810000650.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cb.bin
b822d4339492175ed6930ce02bb1eed0db9cb5d2c66e41d62213b4b63942e279		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 5448 bytes
font_01_sfnt_off0000fb68.bin
b27ac3ecfbe1fbf598ef4e4d737f2d70551c7ba4f1616726cef5ae6c8dd36af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 11344 bytes

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