Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cb6d03adf7289b…

MALICIOUS

PDF

76.0 KB Created: 2021-05-29 14:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d074f1f9efdd9bb0c38ead98d22cbab5 SHA-1: d2a4ada4c09c326d5261372d65694f918d03f645 SHA-256: 05cb6d03adf7289b0ed5c41861ae4d264fdae2a68e7561180d0b405318fcb00e
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on link farm domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=how+to+download+minecraft+on+android+4.1+2
    • https://cdn-cms.f-static.net/uploads/4461250/normal_60282c8b30f0f.pdf
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/1341108.pdf
    • https://cdn-cms.f-static.net/uploads/4415768/normal_603613a6b79a5.pdf
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5fcf3cc27d8a2.pdf
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/milufumiwuk.pdf
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd165d4b4568.pdf
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/kedodijemananulabiw.pdf
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/lozatiremefenulexu.pdf
    • https://xukaxibuban.weebly.com/uploads/1/3/4/7/134701669/d085d1.pdf
    • https://puxomesepose.weebly.com/uploads/1/3/5/9/135977076/litezap-govam-bozovipo-gozidupedati.pdf
    • https://mivezosikobo.weebly.com/uploads/1/3/1/4/131453246/67e72a4af6c182.pdf
    • https://menebunokusup.weebly.com/uploads/1/3/4/5/134588819/439683.pdf
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/8dfd2.pdf
    • https://cdn-cms.f-static.net/uploads/4402933/normal_60218c88d6710.pdf
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/256a149f9adac56.pdf
    • https://static.s123-cdn-static.com/uploads/4472773/normal_5febb5a9aebef.pdf
    • https://static.s123-cdn-static.com/uploads/4374372/normal_6008363240211.pdf
    • https://cdn-cms.f-static.net/uploads/4392860/normal_604649f9b51d8.pdf
    • https://cdn-cms.f-static.net/uploads/4448740/normal_603c488276323.pdf
    • https://static.s123-cdn-static.com/uploads/4450731/normal_5fe55915eecb2.pdf
    • https://cdn-cms.f-static.net/uploads/4446035/normal_606ccbba3c4b0.pdf
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/pavawuz_zufiz.pdf
    • https://ronitodusod.weebly.com/uploads/1/3/1/3/131380212/6820502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000edc0.bin
9191aa3a26aa9baccdd819b5136a82193988f7fa53855312e1040012d5becaa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 5348 bytes
font_01_sfnt_off0000fffa.bin
afb1659a447b456208413e4720f50530256e5358345a813aa0b985a175262ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 10120 bytes

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