Malicious PDF — malware analysis report

Static analysis result for SHA-256 26de2587843c9170…

MALICIOUS

PDF

70.6 KB Created: 2021-01-11 08:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 88f2b7562304fe738115e502fa9d5e7d SHA-1: e69e296a5145ad8db0d5aa5f2e74f17790bbde80 SHA-256: 26de2587843c9170b3c7edaf321f742521e3c4012e1ff25d522b480379b90c95
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or distribution network. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=letter+formation+practice+sheet+free PDF link annotation
    • https://cdn.sqhk.co/vetukalujir/o4UjbQk/mesufavepedaxumilede.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/83ea4bdd9.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/1766599.pdfIn PDF document text
    • https://moxeduve.weebly.com/uploads/1/3/0/8/130814104/libamuzasitetil.pdfIn PDF document text
    • https://vijarupofelufe.weebly.com/uploads/1/3/4/8/134881143/pexanujumos-rirefopu-fipotutevuzif-bagibod.pdfIn PDF document text
    • https://xetolakovi.weebly.com/uploads/1/3/4/6/134604046/mikerisemab-bumine-ripujiredumoxof.pdfIn PDF document text
    • https://jerewerek.weebly.com/uploads/1/3/5/3/135349205/xabeno-patit-putiv-sowivojemivoniw.pdfIn PDF document text
    • https://gamaditer.weebly.com/uploads/1/3/4/5/134583337/5776530.pdfIn PDF document text
    • https://penugevofubelig.weebly.com/uploads/1/3/1/1/131164238/af961afbae.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/jujojomojemiz/luxury_bed_sheets_design.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/61698002482.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/bones_formed_via_intramembranous_ossification.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/rowalalikomaferopuf.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_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 5164 bytes
SHA-256: 10126368e381ebc47df4151e028ec93f234641e5081a18089b401202c1262599
font_01_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 10348 bytes
SHA-256: a2ba07a5a7c89fa2c9f932d576ccc03af848719cba4f70999886a3d2035ad951

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