Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ceba27c13690428…

MALICIOUS

PDF

62.5 KB Created: 2021-01-03 16:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 81e98dbaff35863dd0690121226429c7 SHA-1: 668249ec46435cd9d72e01ad05dfd8bc2885d370 SHA-256: 7ceba27c136904287a27312e376f34dd34029bb613b092b9fb2e327b5de6ed1a
156 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 by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it is part of a link farm or phishing campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the presence of many external URLs points towards a malicious redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=texas+go+math+grade+6+teacher+edition PDF link annotation
    • https://cdn.sqhk.co/tadawatimi/cIhegff/amazon_fire_tv_cube_4k_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/JQ4jghf/mimadomiduzixumufimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5f952bfdde018.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/nesulubenejunoroz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_5f97599cda7d9.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/fegala.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/126b4b5f-746b-4fc8-8408-eca185d25e3b/funny_kung_fu_cat_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/12214261068.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/22568678309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e494e139-2ebb-404b-ad2b-697253b76617/78936999278.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/45893521479.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/journal_of_construction_engineering_and_management_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac078db-b1c2-4ec3-9d72-497348abf0b2/96620953088.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_off0000b8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DB 5492 bytes
SHA-256: f3de9bbefe323a63d65867e3af8e3922a707c17e8fecc4a27c66907125ce1622
font_01_sfnt_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 9848 bytes
SHA-256: 2aa06b4f76c65a3ea4bd53ee6a443643b270ecd5bd2433f544e152c09042924b

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