Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e66330cd9d8bfe2…

MALICIOUS

PDF

74.1 KB Created: 2021-03-02 02:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2a878684423b172bac7c0845006fa7d4 SHA-1: 28a9bb9f03014bcf8d26b8ff2b701f9cc6d46f3e SHA-256: 9e66330cd9d8bfe24a71ba500c0bac5679ed1971185a49a19a08e1eb853e3424
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands, possibly by leveraging embedded JavaScript, although no specific script content was extracted. The primary attack pattern appears to be a phishing or malware distribution lure through a deceptive document.

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://seumenha.ru/strik?utm_term=royal+barbados+police+force+headquarters+telephone+number PDF link annotation
    • https://cdn.sqhk.co/jorobasobu/ZyRceqE/lisose.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/udi_u818a_plus.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/will_winds_of_winter_be_released_in_2019.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/how_to_inform_manager_about_death_in_family.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/ijhDDgd/paintball_usa_linglestown_pa.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/givuwenenasedojebop.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/philips_universal_remote_codes_for_vizio_sound_bar.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/how_to_restart_cisco_router_using_cmd.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/xelofupugo.pdfIn macro / runtime command snippet
    • http://siviveko.getenjoyment.net/how_to_use_remote_starter_mazda_3.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/wujakegu/ftLjjcv/skylanders_ring_of_heroes_patch.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/the_trials_of_apollo_the_dark_prophecy_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lewuli/dagannoth_kings_trio_guide.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/imac_user_manual.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/zemuwefu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 5768 bytes
SHA-256: b5fdba3013bc37157816fc9fb2f86ef9fa8bcafaa939756136c655924053181e
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 10768 bytes
SHA-256: be06592ebbc4fea1c673a95fd6efd817615c80b6a306a8a60a0a3e9e4f4b9cf2

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