Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4b1f2ff202d651…

MALICIOUS

PDF

80.2 KB Created: 2021-03-29 07:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 53e30fdff7bd8c88f2f2e85a7a3511ab SHA-1: 33326f74fc31daec9b715af0d7d5d2bfd9ce3c5a SHA-256: 9c4b1f2ff202d651cfccadac1b0932b95487101fed99844f8108ff1964192f5e
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 0.9998

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://resalured.ru/aws?utm_term=apc+back+ups+xs+1500+flashing+battery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409394/normal_6031d94f287fb.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/jopugigimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_60294268286d0.pdfIn PDF document text
    • http://xotekalulomeb.iblogger.org/najugekexixux.pdfIn PDF document text
    • http://nisiwitas.22web.org/rimoralimum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nidudovuj.epizy.com/adobe_camera_raw_free.pdfIn PDF document text
    • http://gorexoriwow.rf.gd/weather_report_mumbai_santacruz.pdfIn PDF document text
    • http://xevijojikutep.onlinewebshop.net/41186950100.pdfIn PDF document text
    • http://gadusevi.rf.gd/swot_analysis_template_excel_2010.pdfIn PDF document text
    • http://wupaxozejite.rf.gd/xutejozoxob.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/does_netflix_have_too_big_to_fail.pdfIn PDF document text
    • http://walexesanub.rf.gd/44962859855.pdfIn PDF document text
    • http://zajupulavofawi.myartsonline.com/66064117088.pdfIn PDF document text
    • http://wimixuv.epizy.com/funny_animation_videos_free.pdfIn PDF document text
    • http://sadabodavezuzi.epizy.com/laxixuviwitikepid.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/candidose_digestive_traitement.pdfIn PDF document text
    • http://ribowiga.epizy.com/autocad_course_material.pdfIn PDF document text
    • http://sumokunuz.epizy.com/examples_of_tree_diagram_in_syntax.pdfIn PDF document text
    • http://xidozex.epizy.com/frantz_fanon_quotes_wretched_of_the_earth.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 5732 bytes
SHA-256: a89c3e7e8370d099fc73da228dd487a0fce809f739d4bbd8fae6e612768fdc75
font_01_sfnt_off0001008e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 10856 bytes
SHA-256: fd50effab9c6b91ff9085b7fb413db349cc3559efb94d01e29e28a762d2a15a6
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333