Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a78620103c5dc30…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 05:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbacee229c30b65d2807410eab85ac8d SHA-1: b64f4510953cde2240496e1563a9f25d07211b1c SHA-256: 6a78620103c5dc301885b6ee82caa90a5e1edb27160b01f608bdb5db82ce7ce2
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous external URIs, with a primary focus on `resalured.ru`, suggesting a lure to a malicious site. The document body, though heavily obfuscated, appears to be a disguise for sheet music 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://resalured.ru/123?utm_term=elenyi+come+thou+fount+sheet+music
    • http://goligofalu.medianewsonline.com/how_to_reset_honeywell_4000_thermostat.pdf
    • http://vedoluzomo.iblogger.org/fobefunekubuzurepepuno.pdf
    • http://vurujupafowutox.mypressonline.com/92211097777.pdf
    • http://zumewidife.mygamesonline.org/how_to_take_apart_a_keurig_2.0.pdf
    • http://lojuxaga.mywebcommunity.org/29096583162.pdf
    • http://sokixatov.mywebcommunity.org/kolbrin_bible_app.pdf
    • http://puveramodibaf.22web.org/urdu_children_s_books_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gupojakami/irobot_roomba_980_review_consumer_reports.pdf
    • http://xomapagovujux.atwebpages.com/how_to_use_statistics_in_data_analysis.pdf
    • https://s3.amazonaws.com/nevowimo/69070470097.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_8953177ec4c14b1398a1bb81ead69ebd.pdf?index=true
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_a741bdac35c34a8bb34f6483cd278081.pdf?index=true
    • https://s3.amazonaws.com/mejigavukolu/business_mathematics_and_statistics_bba_1st_year.pdf
    • http://kibiviridox.epizy.com/audio_sound_s_for_computers.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/belize_city_travel_guide.pdf
    • http://gabozimipuz.epizy.com/calculus_with_applications_10th_edition_solutions_manual.pdf
    • http://nozozuwovore.atwebpages.com/past_tense_of_irregular_verbs_worksheets_for_grade_1.pdf
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_599194734c4541eca081815b87849eae.pdf?index=true
    • http://lazevemu.epizy.com/bluestacks_free_for_pc_new_version.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_off0000eca2.bin
049ce6a30e52886173aa97e512c2d5539e2bd32bffa8087bec955e0ffba1516c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 4872 bytes
font_01_sfnt_off0000fd29.bin
ee5e5d6847eda8a940b0c70f330e87a57ca1167f5a9b65295f8ccdae92e32614
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 11624 bytes