Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39c3522046eabb4…

MALICIOUS

PDF

79.1 KB Created: 2021-01-27 05:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 155a13e83ce396adbcd1d87b17fb4ae4 SHA-1: 97734a8f188dbdc2a17a286a905b0e5b8182168b SHA-256: f39c3522046eabb48786a5607645f200ddfa22d8019ce4b91927f560d0cf036a
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs, 'https://baarspo.ru/123?utm_term=augmentin+vs+amoxicillin+side+effects', suggests a potential phishing or scam attempt disguised as health information. The presence of numerous links to PDF files hosted on S3 buckets and other free hosting services further indicates a coordinated effort to distribute content, likely malicious, through a link farm strategy. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

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/123?utm_term=augmentin+vs+amoxicillin+side+effects PDF link annotation
    • http://bamovewube.22web.org/basic_math_facts_worksheet_generator.pdfIn PDF document text
    • https://tuvukorop.weebly.com/uploads/1/3/1/8/131857527/sudadejup.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/hWiahiT/music_player_with_lyrics_app_download.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/gagotaniwipure/nedamomu.pdfIn PDF document text
    • http://jekidosokun.epizy.com/54081094525.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/budesonide_formoterol_160_4._5.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/nirunewitalupof.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/gadetorisidozikeziti.pdfIn PDF document text
    • http://gisoduriri.rf.gd/gopolegofedawiwowiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/3d_cartoon_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/hansol_paper_financial_report.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/happy_new_year_2019_worksheets_for_kindergarten.pdfIn PDF document text
    • http://dikawixum.epizy.com/86192710001.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/64972472974.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_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 5364 bytes
SHA-256: df363c6e0cc1b075189394df70c8eb43e46c33f9817ef9aaedcb47945281c65e
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 10660 bytes
SHA-256: 3ea5e760285b42d7880fbf608f19644dbcf2934d724b2dba4dabcf400cfbbdcc

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