Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e59b42e3f70ea4…

MALICIOUS

PDF

80.4 KB Created: 2021-03-08 15:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eba75fd6582321a257a621fb9277487 SHA-1: 52f076ac32930050648d26df31be5177b6ea31f9 SHA-256: 33e59b42e3f70ea4e7222c4c344d9acc28cf7c4bdecd27318c11d0689e727157
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL leading to 'dafemum.ru', which is presented in a context suggesting a search result for 'thunder vpn app'. This indicates a phishing attempt to trick users into downloading potentially malicious software or visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=thunder+vpn+app
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fd74a154de82.pdf
    • https://cdn.sqhk.co/tisezalave/fD5nhN0/74707969506.pdf
    • http://kupiokno.su/ryobi_bt3000_10_inch_table_saw_manual51ymk.pdf
    • http://cookwellbakewell.com/applications_of_partial_differential_equations_in_real_lifegswnj.pdf
    • https://cdn-cms.f-static.net/uploads/4470975/normal_5fd13b707b16a.pdf
    • https://cdn.sqhk.co/konidadelan/RgeHgin/34419130405.pdf
    • https://cdn.sqhk.co/turaxulefa/ichcjid/talking_angela_hacker_eyes.pdf
    • http://ing-jobs-opportunities.com/16829999546lgnp3.pdf
    • https://cdn.sqhk.co/nogorodizet/gjdhfgi/maxabosenuxedabujikeni.pdf
    • https://cdn.sqhk.co/fidumugovoz/eshfGhi/2013_range_rover_sport_off_road_accessories.pdf
    • https://cdn-cms.f-static.net/uploads/4403543/normal_601f2cb3298cd.pdf
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6045baace7c4a.pdf
    • http://new-volosi.ru/nopavn3hlq.pdf
    • http://it50disconto.pro/63861135926c17lw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://magegefopo.atwebpages.com/the_kid_who_ran_for_president_read_aloud.pdf
    • http://pavabiza.atwebpages.com/79173461054.pdf
    • https://s3.amazonaws.com/mujesogi/spain_airlines_information.pdf
    • https://s3.amazonaws.com/nutanigonu/82631752111.pdf
    • https://s3.amazonaws.com/feseni/adding_and_subtracting_fractions_with_like_denominators_worksheets.pdf
    • https://s3.amazonaws.com/sasufufa/88722582990.pdf
    • https://s3.amazonaws.com/pibajuwi/forgot_voicemail_password_android_at_t.pdf
    • http://widepidaba.atwebpages.com/39662421472.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_off0000fe1d.bin
ec7f032a3de4df1ead8285a2632777b48bf07d70a33fb31ec4ed880ebb9fae66
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 4848 bytes
font_01_sfnt_off00010e98.bin
ee59215b36cf0db7e01cf0043725e5cd6cf6c1aff5476a3c0abf22394c93217c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 11236 bytes