Malicious PDF — malware analysis report

Static analysis result for SHA-256 c776bc1c1f848a0e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-14 07:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 95ef574c6d6895a47ef16cedb2bfd67c SHA-1: 197325d768b1a1342b5ea566336abfc6cfc1645a SHA-256: c776bc1c1f848a0e7ff78b507710cf5f15a718c85868e498ef67dae7f0caa80f
226 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm or phishing lure. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the presence of command execution tokens within the document text, and the ML classifier strongly flagged it as malicious. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to wedding invitations, which is likely a pretext to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=what+is+the+correct+wording+for+a+wedding+invitation PDF link annotation
    • https://cdn.sqhk.co/dodufiruw/jggcjcY/space_rangers_legacy_guide.pdfIn PDF document text
    • http://kawlites.online/teachers_salary_texasr7cmd.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/zigopotamesugavoxiw.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/does_raphael_rowe_speak_spanish.pdfIn macro / runtime command snippet
    • http://kexumojazo.mypressonline.com/example_character_reference_letter_for_court.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/que_significa_titulo_salvage_en_un_carro.pdfIn PDF document text
    • http://appletopshop.ru/xevakugagaludewnymc9.pdfIn PDF document text
    • https://cdn.sqhk.co/terupilenu/cIKGCdS/kajuluwirusoxe.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/24999074350.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/tijowo.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/L6ji6gd/finojisi.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/YzjbhbH/wyvern_creations_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/h2gdgef/equivalent_fractions_chart.pdfIn PDF document text
    • http://maleev.online/457541762776v6id.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/cNggfva/exoplanets_3d_lite_stroller.pdfIn PDF document text
    • https://cdn.sqhk.co/padumaxifop/JSmidhd/17666466627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nivuzujanux.myartsonline.com/garod.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_71401160ace940c1a73e26df9a96a1ad.pdf?index=trueIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/61213014812.pdfIn macro / runtime command snippet
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_9c7a4019d97c4efd8e8641a51e7cdfbf.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_5a77304fbb434d0894dbb25d2c51ab60.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_7b4e4c7469d34eda9c5d899329ae765e.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_1d19b33325704f1f8f1e014120b84bd6.pdf?index=trueIn 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_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 5416 bytes
SHA-256: 8ae6e67e32e61fa4e209dcafa7656e023a9b6181f81cab08a3e96dbf74faa1ac
font_01_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 10952 bytes
SHA-256: 54ac44ce07ce45807354ad1c4412bba78d7f5327461ee53bb74baaed1791c623

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