Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa159093393789b…

MALICIOUS

PDF

95.7 KB Created: 2021-04-16 11:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8bf5006fff0798373e3c09448d0d156a SHA-1: a34f03dbb686e0a566d15d7ebe399d83c22e2c95 SHA-256: 9fa159093393789bccbfc82811ef705184da9de0ccd3e08080919c82bf47a3a8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document, likely delivered via spearphishing.

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
  • 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.
  • 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://lozipotod.ru/strik?utm_term=resumen+del+argumento+de+luces+de+bohemia PDF link annotation
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/7277280.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/zogejemadeva-notafivunamob-betazodevawi-wiperenaduxozap.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/Ggehege/59378185160.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/af2e648e2e66379.pdfIn PDF document text
    • http://vozaxakinexu.iblogger.org/4101373400.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/koxugi.pdfIn PDF document text
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/8662731.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/5b9f0149.pdfIn PDF document text
    • https://tisemijosugimuv.weebly.com/uploads/1/3/1/0/131070246/nukubitus.pdfIn PDF document text
    • http://simekavo.22web.org/does_behringer_c1_need_phantom_power.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/ji9lVgh/air_traffic_control_game_online_simulator.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/darifefazojil.pdfIn PDF document text
    • http://bamasadukarudam.iblogger.org/7628818416.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/8436607.pdfIn PDF document text
    • https://jonokerozub.weebly.com/uploads/1/3/4/7/134714828/9177437.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/kitolepapufun-miligu-mujado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4e11a7-da38-4081-a1c3-c0bf50ed6270/91453751358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae62c88-35d8-479f-a32b-1dbdda7f9c52/ohsas_18001_audit_checklist_xls.pdfIn PDF document text
    • http://vuvuvemalazot.epizy.com/kegefefejoneximebiz.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_off00013475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 5500 bytes
SHA-256: f77d24e3548c29a63b46b7cb4c7db42c2cfdd921a599cc7d44a440838a383d53
font_01_sfnt_off000146f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F8 12900 bytes
SHA-256: bdca2188b2c1b4391e02f65527f484637cbd94d298fbfab89651f31189cd6dca

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