Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f676eb95203c40…

MALICIOUS

PDF

74.1 KB Created: 2020-12-04 14:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d9b6883738dae8b6a2584955465eaffd SHA-1: c5d4e2d24d83e4f037a2bc73d47d52239296def9 SHA-256: 13f676eb95203c407c48dd954489e51e0339f6551746a8e6908bd20db29ac501
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://trafffe.ru/123?utm_term=callaway+big+bertha+hybrid+2019+adjustment+guide PDF link annotation
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/46e3346730.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/nonipesikiri/botedimivatize.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/7053005130.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/bass_guitar_for_dummies_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/police_helicopter_crash_glasgow_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/513a5130-daac-4675-a20f-8b2af0f3ea6b/21543362922.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/xmod_apk_bluestacks.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d1c52cf09257bd84ca4b/t/5fc789c80623334b0c6359b9/1606912456859/74929884339.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/46171139418.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/vikokonunesiw.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/ti_ultraviewer_6._1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/sodupimak.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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 6036 bytes
SHA-256: f0dd1d62171b4a032b55e7f4db88cc4e3a19a3cf0013b50eb881e3c690577064
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 11356 bytes
SHA-256: f1d5bd05ee9fcdc307b183a9b4a5ed4a46a52d21d4d8e286a7657304b2048c9e