Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df5590da0e12a31…

MALICIOUS

PDF

87.4 KB Created: 2021-04-16 20:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65453cfa4ad22502718c78c0ba4fa16f SHA-1: 88eec10340a8aca7a398ff34a575445bdadce984 SHA-256: 2df5590da0e12a31387a0f7a9f019d69078b6af7f63b949c8a725c98b9a920d0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple external links, with one specifically pointing to a URL that appears to be part of a phishing or malicious campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of 'cmd.pdf' and a URL in the document text suggests an attempt to execute commands or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ponafet.ru/strik?utm_term=how+to+prepare+for+a+school+nursing+interview
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/bidamenepuserekoku.pdf
    • http://mscredit.info/lady_windermeres_fan_character_valuesqu846.pdf
    • https://cdn.sqhk.co/fulaxanew/jc4jegj/25233940363.pdf
    • https://xikubafol.weebly.com/uploads/1/3/4/6/134607040/e37d1766c44f2.pdf
    • http://hurleyshamburgers.com/asterix_la_fille_de_vercingetorixpbosa.pdf
    • http://bumawusuka.mypressonline.com/acca_f1_mock_exam.pdf
    • https://cdn.sqhk.co/wusuzevomo/eZJidDg/rikunubarobebakewos.pdf
    • http://vobalemujumojak.mywebcommunity.org/83665932552.pdf
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/6e671e465cd26bc.pdf
    • http://uspehdnyaaxyz.xyz/racing_city_3dg0h7c.pdf
    • http://sadogiropi.mypressonline.com/ensayo_de_las_reformas_borbonicas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jepinebawo/36397383704.pdf
    • https://uploads.strikinglycdn.com/files/52849ea4-e2a2-4531-bb23-6d3245ff5737/2389257258.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/57499636978.pdf
    • https://uploads.strikinglycdn.com/files/3e088609-0681-4e0f-ba8f-0c65833293f3/what_is_esperanza_rising_about.pdf
    • https://uploads.strikinglycdn.com/files/4119e297-d109-43d7-b6f6-f191006ad49a/how_to_check_computer_history_using_cmd.pdf
    • https://s3.amazonaws.com/juduk/waltz_in_e_minor_carulli_sheet_music.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_off00011845.bin
97143801e2a3840c678adbad0d19a7f12edd80f5ebe12de1f1ea4da4fabe4d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 5388 bytes
font_01_sfnt_off00012ab6.bin
b32a50016b98d7713b586406573c0d07c08dd7eefb34ec1588c3cab1dc2fc2fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 11140 bytes

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