Malicious PDF — malware analysis report

Static analysis result for SHA-256 415f211bf1bf0807…

MALICIOUS

PDF

69.6 KB Created: 2021-01-13 18:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 415f3412ead7252f73ea051b07bc47f8 SHA-1: 92074abc15178c13014e1150540eb0b6734f3838 SHA-256: 415f211bf1bf080726513e0fb4a2395ff268f52bac420f2191580a51acdccd70
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'Baylor bookstore contact information', suggesting a lure. The presence of numerous external links, including one to a known malicious redirector, indicates an attempt to lead the user to harmful content or infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=baylor+bookstore+contact+information In PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5fa9d10d45002.pdfIn PDF document text
    • https://site-1172683.mozfiles.com/files/1172683/32330990672.pdfIn PDF document text
    • https://site-1203132.mozfiles.com/files/1203132/wivosisa.pdfIn PDF document text
    • https://site-1175348.mozfiles.com/files/1175348/mojegibaz.pdfIn PDF document text
    • https://site-1171658.mozfiles.com/files/1171658/sinetatop.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/nedorusova.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/RjeifKK/8563631659.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/ihcyYjh/merge_dragon_midsummer_event_cloud_keys.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/juvuraguvutoxif/12704019706.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/janeziganuligakis.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/renton_police_department_incident_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/51097536776.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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 5384 bytes
SHA-256: ae6dcb6364df9d7b77dc2f182a50b5e74468b0009f4a3d1d64d569a00a700489
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 10852 bytes
SHA-256: dc3082c57237d34fb47ec4c6072c3adfb4d3002fe540b9c642b6d01ee32796b2

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