Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d413270ad10b779…

MALICIOUS

PDF

81.4 KB Created: 2021-02-02 09:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7d1a1133f30f2785baba9ce09dc4e9e7 SHA-1: c684de2c4b9dc04056d10760c4082439e071e78d SHA-256: 9d413270ad10b779c94f40c01e7566b30f193304e25ab54519e07497130b8ed9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL 'https://baarspo.ru/aws?utm_term=apples+and+bananas+piano+sheet+music' is the primary lure, attempting to disguise malicious activity as a search for piano sheet music.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/aws?utm_term=apples+and+bananas+piano+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454982/normal_601713cda4589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490116/normal_5fcdc6ce9e2a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418556/normal_5ff5d3857020c.pdfIn PDF document text
    • http://nevoxukuri.22web.org/buwudoxibenivuzuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471971/normal_600368444d1f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406776/normal_6000e7c26b0c7.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/bijetigawonesalafet.pdfIn PDF document text
    • https://kesizimi.weebly.com/uploads/1/3/1/3/131398366/431179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fef6b7877236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368991/normal_5fdf213c9585b.pdfIn PDF document text
    • https://firalikagux.weebly.com/uploads/1/3/2/7/132740609/wiluwovudadulagek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_5fe8f1799ab8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd35944ae47f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_6010b63b5c836.pdfIn PDF document text
    • https://kowexemi.weebly.com/uploads/1/3/1/8/131872048/9002132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofupiwosilabo.epizy.com/all_messenger_photos_pc.pdfIn PDF document text
    • http://zalezir.epizy.com/fipijivij.pdfIn PDF document text
    • http://lapekekefexe.rf.gd/cambridge_checkpoint_science_workbook_8.pdfIn PDF document text
    • http://bunulewokiluko.epizy.com/17583580644.pdfIn PDF document text
    • http://gesasodalunaka.epizy.com/o_mio_babbino_caro_lyrics_sheet_music.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_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 5344 bytes
SHA-256: 74b4975805b2cb52762b5dfd743cb647a28961b74de6fb4e9a32341b8821feba
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 11136 bytes
SHA-256: a7e1206660143bf74523d4eeb6cec5969fc239f4509cdf0730a6e99ae13f48f3

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