Malicious PDF — malware analysis report

Static analysis result for SHA-256 b301c062e913d624…

MALICIOUS

PDF

80.6 KB Created: 2021-01-14 15:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 85e003e274358a0f3ded84f8655f477e SHA-1: b26b11a3fb584cf969a5997fc7ea0b1be4bb452d SHA-256: b301c062e913d624a4e6a66f93174da59e3ca6632c3a5b5cda9f1613da9a9397
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting an attempt to drive traffic to malicious sites. ClamAV and ML classifiers also identified the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the document's structure indicate it's designed to redirect users, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=private+school+1983+google+docs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5faab5e575275.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/soboxa-bebag-timinedano-samefokolil.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/iflkOjj/plants_vs_zombies_2_online_no_download.pdfIn PDF document text
    • https://site-1179337.mozfiles.com/files/1179337/63448388871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474999/normal_5fc4dcfa30859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_5fbccc2778c91.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/sesijesule/25310484350.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/primary_care_a_collaborative_practice_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/goku_black_vs_android_17.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/migipiluzisapeg.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 5828 bytes
SHA-256: 79fd4a01ceb477a00d33e0dcc899cbe51435bfde25beff125086f9a472b470c4
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 14492 bytes
SHA-256: da7eaa24a2dd1d52072ecdf220b5c4b6006ec06fa894d10ed8ce4b94234daa64
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 16376 bytes
SHA-256: 069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c

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