Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1db7648f941fefb…

MALICIOUS

PDF

105.4 KB Created: 2021-03-17 09:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bcff677b3bac723c2ba6bbf3d71aee55 SHA-1: 887c8cd5893df6740c5a5392689a01ed2054b8c9 SHA-256: b1db7648f941fefb7b54e96f55a6fb0a6bea98af078b79fe95a9eb686e6a7c44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=admin+dashboard+html+templates+free PDF link annotation
    • http://ruvinowuge.scienceontheweb.net/acordo_de_basileia_ii.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/kibutifo.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/6122268383.pdfIn PDF document text
    • http://kabomodom.iblogger.org/jim_wendler_5_3_1_beyond.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/bijumoresoxulijutu.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/waseged.pdfIn PDF document text
    • http://sadipize.scienceontheweb.net/printable_calendar_august_2020.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/colorado_academic_standards_reading.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/general_deterrence_theory_definition.pdfIn PDF document text
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/bibul.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/67198874447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/saris_cycleops_fluid_2_trainer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/casio_edifice_5041_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/how_to_present_interview_data_in_qualitative_research.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/xuzakodumirubumekive.pdfIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/sop_for_analgesiometer.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/aruba_virtual_mobility_controller_configuration_guide.pdfIn PDF document text
    • http://dikivila.epizy.com/2340984014.pdfIn PDF document text
    • http://widifusi.myartsonline.com/pick_up_type_impression_coping.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_off000161b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B3 5412 bytes
SHA-256: fb73a7340f4b36c6e39b1e5e82d84b457a90d5c6de9f12dfe4cada52da494c21
font_01_sfnt_off000173df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173DF 10440 bytes
SHA-256: aca30b6f3b08ca8ca4f435e3b36bb3d970e67e520c74c728091a42fa75dc7972