Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec47d42128ef4d7…

MALICIOUS

PDF

69.2 KB Created: 2020-12-15 14:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f077b1960b3007b07c1a6fed787001cb SHA-1: 1bb9e0a5232bb3bb444f41238ecd8f1b7efa35f0 SHA-256: dec47d42128ef4d7feec8b5f2e1f041a30e68b27e402401c4552e7b3d4d3a651
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to malicious sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=scary+stories+treasury+pdf
    • https://gofolonuk.weebly.com/uploads/1/3/4/3/134313710/sujagu-vojuwuvegaxeri-puzagur.pdf
    • https://rudoliretumuw.weebly.com/uploads/1/3/4/8/134861944/8232571.pdf
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/zadogisotibinax_risuwunij_gotisebenujal.pdf
    • https://badupulok.weebly.com/uploads/1/3/4/8/134855905/85c9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5dd8f731-3105-4285-9882-eb1d43bad07b/zell_miller_scholarship_emory.pdf
    • https://uploads.strikinglycdn.com/files/89d30c2d-117a-40ff-a5f7-5c87baa68898/gafufudageve.pdf
    • https://s3.amazonaws.com/wutezigojuxi/cadet_command_regulation_145_1.pdf
    • https://uploads.strikinglycdn.com/files/4918f052-cefe-4946-ae34-728c916e2566/zatid.pdf
    • https://uploads.strikinglycdn.com/files/6c98c076-62b2-4df9-b16a-0549711ee41e/xewuzokawegiteruxajoj.pdf
    • https://s3.amazonaws.com/xoxaneral/hansteen_holdings_plc_annual_report_2018.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01056a371610b8780aab/1606222086168/4146849352.pdf
    • https://s3.amazonaws.com/vibuvomomuv/4184102261.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d4.bin
57bd880e0f74b58befcfeecb7efa3481cf38b12e9826c9c111fe90e4473d1e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 5324 bytes
font_01_sfnt_off0000e40d.bin
f530baa57e06e2233dc5c385145cfc55b43ed37073574b9ead13baeaeb880a09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 10508 bytes