Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40b89c7c02700eb…

MALICIOUS

PDF

76.0 KB Created: 2021-03-07 23:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b32a2e5e22429b5e475354390c7ab38b SHA-1: d381106aafeb6069094feb0026e4271944d79f50 SHA-256: a40b89c7c02700eb723700ff61d0253e122f9bbaff634f665fda629cbe7e7d49
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being 'https://jacksth.ru/strik?utm_term=what+kind+of+formula+does+wic+cover'. This heuristic, combined with ML and ClamAV detections, strongly suggests a malicious intent to redirect users to potentially harmful content. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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+kind+of+formula+does+wic+cover PDF link annotation
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/8a4e7961.pdfIn PDF document text
    • http://nujipam.iblogger.org/qu_significa_dolor_en_el_brazo_derecho.pdfIn PDF document text
    • https://sidonakitipu.weebly.com/uploads/1/3/4/6/134631457/3d0fe.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/mawewekiwad.pdfIn PDF document text
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/kagawekibutifari.pdfIn PDF document text
    • https://kesavowefobulet.weebly.com/uploads/1/3/5/9/135976175/gefolematejetefa.pdfIn PDF document text
    • https://woxatawupipop.weebly.com/uploads/1/3/4/0/134016674/d410d854a130482.pdfIn PDF document text
    • https://keberalu.weebly.com/uploads/1/3/4/7/134725283/9903708.pdfIn PDF document text
    • http://manipiso.iblogger.org/25554608662.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/vofadoloves/leg_ulcer_management_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/64980110248.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/fexaboruka.pdfIn PDF document text
    • http://tujevudaxuxos.epizy.com/chinese_new_year_greeting_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/85515495608.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/71014425884.pdfIn PDF document text
    • http://vefagukolile.epizy.com/27457103933.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/compare_entries_in_two_excel_spreadsheets.pdfIn PDF document text
    • http://rawuwad.epizy.com/corporate_visiting_card_design_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/51052667345.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/xoneg.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/fokinexib.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/mongodb_vs_cassandra_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/electronics_for_you_projects_and_ideas.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_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 5492 bytes
SHA-256: 4b5ad89c7daa73dc26132d8729b33e56b66208538f1f86390396a3fbb67cc4b3
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 11556 bytes
SHA-256: e9a8f3d89e56678e742a1b6ff08fcc24d2543b3f65d667252924886581ab3638

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