Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c23dcc323af64…

MALICIOUS

PDF

68.8 KB Created: 2021-03-31 03:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e90263edf27607e6e2179d159e44fde SHA-1: 1ea277446fd11d25c5d56ad06e49cf40f1d6683a SHA-256: 6d3c23dcc323af6423305b0e6d8d8a621b29f3a7dd1d3337bb59989b7c2c0ebf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of phishing or malware distribution schemes. The document body, though heavily obfuscated, suggests a lure related to song chords, which is likely a pretext to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=opm+songs+with+gd+em+c+chords
    • http://josumewemuzob.getenjoyment.net/uniden_bearcat_bct15x_manual.pdf
    • http://jogajep.medianewsonline.com/water_supply_and_sanitary_engineering_rangwala_download.pdf
    • http://ctuxuu.com/stages_of_mitosis_worksheet_biology_if87653core.pdf
    • http://all-host.site/80011864970llf94.pdf
    • http://prizinsta.site/tedotafaxod0rycb.pdf
    • http://donbetosstreettacos.com/who_invented_telescope_for_the_first_time_in_16085o4x0.pdf
    • https://cdn.sqhk.co/jigidokasaga/Stb1pK7/64402140683.pdf
    • http://copyrightmediahelp.com/aasld_practice_guidelines_hepatic_encephalopathys8boe.pdf
    • http://gibelepij.scienceontheweb.net/28638516629.pdf
    • http://damvglaz0.xyz/vusasakowanadolixewuzolu3suft.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dinilederu/bmw_x3_owners_manual_2013_uk.pdf
    • https://uploads.strikinglycdn.com/files/b143f635-20ad-40a6-b5e0-7b089f50bc07/taurus_pt111_g2c_9mm_bullets.pdf
    • https://s3.amazonaws.com/gekojulog/5483025529.pdf
    • https://s3.amazonaws.com/purixifusipelid/dimesusubo.pdf
    • http://wavexijazibivat.myartsonline.com/capitec_bank_job_application_form.pdf
    • https://uploads.strikinglycdn.com/files/088161f9-1352-4157-b7ae-a79f292e3c06/revuxoveworobenoze.pdf
    • http://gefilodeza.myartsonline.com/rigefadufebed.pdf
    • https://s3.amazonaws.com/fotepopunaj/99253199349.pdf
    • https://uploads.strikinglycdn.com/files/83c17859-333f-47eb-b322-3fa8007ebfee/what_are_the_different_types_of_abbreviations.pdf
    • https://uploads.strikinglycdn.com/files/6b30e4e6-7175-45fc-a957-41599cc37f7a/are_speed_queen_appliances_good.pdf
    • https://uploads.strikinglycdn.com/files/97186800-63fe-44f5-b06f-79918e06b429/ejercicios_de_trigonometria_triangulos_rectangulos.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_off0000cfd7.bin
e68036eee7a9f2b4dcca3e722336d68a8ca68855c8c2387503873c1f05edf8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 5364 bytes
font_01_sfnt_off0000e1fc.bin
ad185914184528ff68ec274844ab6c6ee95b77d97e0f8541ff6a74a0951f672a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10608 bytes

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