Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3793fe43e32a35b…

MALICIOUS

PDF

77.9 KB Created: 2021-03-16 16:38:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87de0ac6b343f98429f02fc8ebe107af SHA-1: 138e817baf44315d63cce0f95fa9e6229f8c79bf SHA-256: d3793fe43e32a35b6035dd557729e562ab986538ddc0444e7e08a4ddbc8af344
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to Craigslist bike listings. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=craigslist+chicago+bikes
    • https://cdn.sqhk.co/jidevumedure/jAwjc7F/rodomesama.pdf
    • https://cdn.sqhk.co/numovasovev/fygggh3/momanotipul.pdf
    • https://cdn-cms.f-static.net/uploads/4454559/normal_600c6165ec0dc.pdf
    • https://cdn.sqhk.co/dugixikisim/fjezojb/arrow_go_kart_parts_for_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4405674/normal_60167588d1b33.pdf
    • https://pofekivivefuron.weebly.com/uploads/1/3/5/3/135339802/e5870a11ce056.pdf
    • https://cdn.sqhk.co/nugofonavuf/hf9Lhax/9414116041.pdf
    • https://cdn.sqhk.co/fabunavaxa/fidjhgf/70618630782.pdf
    • https://bisatabezuniv.weebly.com/uploads/1/3/1/3/131398333/da240913e.pdf
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/nuvijudisike.pdf
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/mipomazepaja.pdf
    • https://static.s123-cdn-static.com/uploads/4474478/normal_5fffedd012b28.pdf
    • https://kanunobak.weebly.com/uploads/1/3/1/0/131070574/a6b28.pdf
    • https://xifugewelude.weebly.com/uploads/1/3/4/3/134353264/1252735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_37d634b8b7424e98b97f88a4b19d0bfe.pdf?index=true
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_5d438a12b0024ced8fb70b6f1285276b.pdf?index=true
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_182c99b07be4414483147247f9c156ef.pdf?index=true
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_7e8329c6c0794292998fc0e56c192324.pdf?index=true
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_acf7bc735513494bba6477a8a7c54cf1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e5.bin
8f5efab1457bcd907abffc588ec94b2a36f2ccf639912e794da7748c48acf97d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 5172 bytes
font_01_sfnt_off00010672.bin
6f612d74f0673c54a126a309f7c9a6a718252591efd53caab986d871eac7f839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10604 bytes

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