Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f26e547ddfb631…

MALICIOUS

PDF

67.2 KB Created: 2020-11-23 18:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f835734b750ac9fa3921a4a88b93d320 SHA-1: 9b29cc9d188fbbb75cf4ccb40bf5ac5ecd73db45 SHA-256: 50f26e547ddfb631ac76892979bcd953001a8058fc10d7f7bdf4ecfab696e42e
156 Risk Score

Malware Insights

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

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=vcomin+fetal+doppler+user+manual PDF link annotation
    • https://nepigisebax.weebly.com/uploads/1/3/4/4/134477897/kuvut_nakolewatorabo_dakukusifurixaz.pdfIn PDF document text
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/4848498.pdfIn PDF document text
    • https://rifeseroki.weebly.com/uploads/1/3/4/6/134698736/sizidav.pdfIn PDF document text
    • https://lepebixetuvenal.weebly.com/uploads/1/3/4/6/134634058/bd56fa7e79.pdfIn PDF document text
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/d5103502b1.pdfIn PDF document text
    • https://dubuzimonovox.weebly.com/uploads/1/3/4/3/134347386/nuxubaxuwasigu.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/tibanepoxilibud/two_way_repeated_measures_anova_spss.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/josaderejekududivepamo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/go_pro_eric_worre.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/57640860281.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/setoravesijodisuvowo.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/arrowhead_beach_nc_hoa.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/confessions_of_a_scholarship_winner.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_off0000c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 5264 bytes
SHA-256: 8438810a4dda4ad8be08e98733c8589792e316a7462183257d4056f3d3cec820
font_01_sfnt_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 12180 bytes
SHA-256: 159946924bb45b75b31c9c988cb3497d5f7ca5bb2d7df2a72099498437a45db6

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