Malicious PDF — malware analysis report

Static analysis result for SHA-256 b818b842e25ba4f0…

MALICIOUS

PDF

71.4 KB Created: 2021-02-05 14:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e81bc188b52cf6938f0be613146e2521 SHA-1: fb9c5fa689d7a2afa8520b4a533c99bde03eb4d9 SHA-256: b818b842e25ba4f06a46734e9fa9f8f19905af4678800c6b50f1c542010058d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary URL points to a suspicious domain.

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://jacksth.ru/123?utm_term=burberry+employee+dress+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480387/normal_601a6d5bde2ca.pdfIn PDF document text
    • http://alex-travel.moscow/baby_shower_templatesk0s6g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5ff8027b953a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409244/normal_5ff22d49f3a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_60111d1047983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377380/normal_5ffe92977dc9e.pdfIn PDF document text
    • http://hookup153.site/spices_hut_cary_nc21a54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444874/normal_5fff6d2bbdb7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387427/normal_6003091b1ea99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446646/normal_5fe2e4c068a37.pdfIn PDF document text
    • http://lavkavkusa.store/dubai_drift_2_mod_apk_rexdl2iba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_60194a224a845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5fe4d572105ef.pdfIn PDF document text
    • http://umniashka.ru/dufavezesulqbp5.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/luxubase.pdfIn PDF document text
    • https://gitarufimoka.weebly.com/uploads/1/3/4/2/134235546/fiferel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziboporo.epizy.com/chauvet_intimidator_spot_duo_user_manual.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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 5300 bytes
SHA-256: 006cb82e8640e0843f72e157933d8e91e85fb05a4dfa25d9477740b9a4736ef5
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10692 bytes
SHA-256: f2721103ddbc65dd65792ba6eee0abd2d3041b4fffce2082816d57ea8f280e5f

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