Malicious PDF — malware analysis report

Static analysis result for SHA-256 08370d5d9732e93b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 10:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f1a0c6fcf9e0582d21280ec6276963b SHA-1: e9eda2da5e3926c385b3e495d29be730c88f733f SHA-256: 08370d5d9732e93b3abd14e1890edbee20497016555cd18bfd580e278096ca11
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains a large number of external links, suggesting a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the presence of numerous external URLs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://static.s123-cdn-static.com/uploads/4421778/normal_5ff93acce2007.pdf
    • https://cdn.sqhk.co/nefakovuwot/fiilhg5/23865097280.pdf
    • https://cdn-cms.f-static.net/uploads/4412158/normal_6020408e28ad7.pdf
    • https://cdn-cms.f-static.net/uploads/4424043/normal_6050f6e84fe13.pdf
    • https://votumojelobi.weebly.com/uploads/1/3/4/8/134848055/1999211.pdf
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6014d182a1be2.pdf
    • https://jokepalebaja.weebly.com/uploads/1/3/4/3/134360350/fukivetumafazazu.pdf
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/3972659.pdf
    • https://cdn.sqhk.co/zunezafi/dhjhehj/xirizaxokivuxi.pdf
    • https://cdn-cms.f-static.net/uploads/4419451/normal_5fe6867679396.pdf
    • https://babifufagisuku.weebly.com/uploads/1/3/4/6/134605010/sefanepate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=singular%20and%20plural%20nouns%20worksheet%20class%203
    • https://s3.amazonaws.com/rudelazifizuvo/veruzebezeregawup.pdf
    • https://s3.amazonaws.com/pujirageg/rojonu.pdf
    • https://uploads.strikinglycdn.com/files/7e44f3f9-123e-4f05-b572-773b7499297a/39474893961.pdf
    • https://uploads.strikinglycdn.com/files/32d500c1-49ac-4f47-814e-4ba89fe05940/90139056139.pdf
    • https://uploads.strikinglycdn.com/files/83394cc9-ec55-498e-a540-82c943fce5ac/26620942085.pdf
    • https://s3.amazonaws.com/zidenigad/program_esp8266_arduino_uno.pdf
    • https://s3.amazonaws.com/xamapebonijos/21284254179.pdf
    • https://uploads.strikinglycdn.com/files/78b5c863-964f-4eda-90e9-80b7871b612f/69255562416.pdf
    • https://uploads.strikinglycdn.com/files/1d9b9c37-0954-48d2-aaa4-b7bd90e9c830/75597350564.pdf
    • 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_off0000e971.bin
8ee4f911ed9a1fe4e77d89a8844988e49cb762eafba9bbbbd4d5d2795176d880		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5760 bytes
font_01_sfnt_off0000fd1d.bin
24ceda6dcfdd15689b6798bdd3f94dfcfeb2b55d7dc177f545574315cbfccf58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 10768 bytes

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