Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ca4628d8c63243…

MALICIOUS

PDF

68.1 KB Created: 2020-12-20 18:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dc674b843adc671553fb6e8b7854b94a SHA-1: 96a5f69e1b94d77d4816529178e1ae4bc6406982 SHA-256: a1ca4628d8c63243a0cf2610993c50db9120eb0d6b8d251c3cab5cabe52149e7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://traffnew.ru/strik?utm_term=how+many+weeks+of+school+are+there+in+a+school+year PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421051/normal_5fb026f4001dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f87e94c3d6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_5fd0a1f51945c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f95940208841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5fd85697e535b.pdfIn PDF document text
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/d9845db00149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fbc33c984d55.pdfIn PDF document text
    • https://tamoxukezoge.weebly.com/uploads/1/3/4/5/134585929/kuvabisan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5f8c1c4a605cd.pdfIn PDF document text
    • https://vutifiruva.weebly.com/uploads/1/3/4/5/134595151/wewepeja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d786eb26-b4fa-4f87-a442-b6561c120c6b/10780373907.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/garrapata_beach_surf_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe3809f-2ce3-42cf-a697-153010db1097/mediabase_top_40_adds.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_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 5340 bytes
SHA-256: ae2721b531b505cda35d1d03ff572d75a4ef8569cd233c5386c6bd593e2875b3
font_01_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 10604 bytes
SHA-256: 2a8921f006baf3d47ccaf70779fb2576139a87bbf4248d596b3e417057609c2f

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