Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ed32f342a87edb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 23:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45d2ccd24d1ff258b3bda107c5af8aaa SHA-1: 7667cb84cbc9510e76b556b72915bf401b89ba8e SHA-256: c8ed32f342a87edb2361eb46f41030369a0c2edb9515a2a94c001e6e15b232c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests an attempt to obscure the final destination or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coolingrealestate.com/your-home-cleaner/FCKuploads/file/muguforarudamu.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/ziloxelobisigilagusu.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/penujuleja.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/10323894958.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/wakijemub.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/rexojidalofa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613390db0411b---71530637072.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/jogadevuwikutili.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/rotuvojozelikurunidipevo.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/33138000701.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/1398468123.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/20946831999.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/71651569613.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/4892986978.pdfIn PDF document text
    • http://retailcop.ca/files/rosizedej.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/21551397426.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/zesojututomekefovusizip.pdfIn PDF document text
    • http://gnox.vn/upload/files/76727792009.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/d51n383i9g8j107laq59mk67ubo1gtih/55047335710.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/miwoxujewapajukikekenozup.pdfIn PDF document text
    • http://weshare.vn/attachment/files/12581623543.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/saropa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=research+methodology+in+economics+books+pdfPDF link annotation
    • 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://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_off0000ba1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1E 11460 bytes
SHA-256: 46312700df4eea7def9386cbd6911e040ab0a24627c3593187e9c90122ba23cf
font_01_sfnt_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 16304 bytes
SHA-256: e6501a914c5ad9b234f3487f441884273257c2c1e2e022f7f471dca23e6fb39e

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