Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fa109bbe5f6e7f…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 17:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f7f6fa6070112bc3c5220a4672f0100d SHA-1: 811da110d8500099501d8c548aa6e1f16b709fcb SHA-256: 77fa109bbe5f6e7f1f2cbac3081963da9f43ecd8fb54b89fb1d6a96caf84f294
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, indicative of a link farm or distribution network. The primary URL, 'https://baarspo.ru/strik?utm_term=lista+de+verbos+en+ingles+en+pasado+simple+pdf', suggests a lure related to English verb conjugations to disguise malicious intent. ClamAV and ML heuristics confirm this PDF is malicious, likely a phishing or trojan delivery mechanism.

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 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://baarspo.ru/strik?utm_term=lista+de+verbos+en+ingles+en+pasado+simple+pdf PDF link annotation
    • http://uaportal.site/ping_pong_the_animation_themezq4ql.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/c383b0f75de.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/9hbhjfQ/vovufabixipiwexomi.pdfIn PDF document text
    • https://megojame.weebly.com/uploads/1/3/5/9/135992505/f4b90860.pdfIn PDF document text
    • https://cdn.sqhk.co/safajoju/Wifji7V/land_rover_defender_2020_price_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/fqn9oij/lafetusokipolakilisowop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5fcb1dbb595b4.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/buhfmU4/solar_system_3d_model_nasa.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/xeruxaxer/sivezuzetumaxep.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/54711161391.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/excel_spreadsheet_keeps_opening_as_read-_only.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/kerner_commission_report_1968.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/risk_matrix_template_4x4.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/ksi_beerus_free.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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5500 bytes
SHA-256: 313d42e884146e5e9aea43a745ac2149ecee31498db760506d902321cacad6f6
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 13320 bytes
SHA-256: fa124d731cc5b551bbc3289c9c303f6e0ccf1a162547aa3d08f3198a7aa87863

Open this report in the interactive analyzer, or submit your own file for analysis.