Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bf25e2e3254d0a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-05 07:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91914d5340b3eff2fae8fc45ba552a36 SHA-1: 5b49cb9e93ca4d14229d7784667b5055b86f14c3 SHA-256: c1bf25e2e3254d0a7a626dd45b0e0166cf0c63fc7214b2f7cef1cea4823dbd09
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://mezovuduw.ru/123?utm_term=albeniz+cordoba+pdf, is a primary indicator of malicious activity. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing or malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/123?utm_term=albeniz+cordoba+pdf
    • https://static.s123-cdn-static.com/uploads/4402289/normal_6004b7f7b1127.pdf
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5fc601409ab0f.pdf
    • https://static.s123-cdn-static.com/uploads/4451018/normal_600987c4be515.pdf
    • https://static.s123-cdn-static.com/uploads/4465907/normal_5fec418a55954.pdf
    • https://cdn-cms.f-static.net/uploads/4365619/normal_6061c52c73c98.pdf
    • https://cdn.sqhk.co/jogibigeda/ifPMidy/titozaledirawewezapo.pdf
    • https://cdn.sqhk.co/juvanejejuwo/bjzzrji/2833276559.pdf
    • https://cdn-cms.f-static.net/uploads/4465548/normal_605c18b649cff.pdf
    • https://cdn-cms.f-static.net/uploads/4454670/normal_602fa1cd904b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_a6bc32a707f34454952eb373609a8af3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8590fb3d-1da4-420b-8833-9c99ba9f2bfb/jifigojetoj.pdf
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_182db9058e7a4f378c2f16f69fbdbbcf.pdf?index=true
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_f23e5d583e2341399912f130586ae43d.pdf?index=true
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_23ca53b4620941ee9e897c2985e74909.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_73c1216998c74ceba8444a01c986b9fc.pdf?index=true
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_eba888d990134c6db4f673e2cb0e9345.pdf?index=true
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_4235e7a9641e4036aaba940f49cb32af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6cf6e4c7-1c5c-4ba2-a2af-b2c556744865/27888677140.pdf
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_e0469eb2cc034eacb5ec6d2d5164d3de.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_eaa194b7343742149023e5168829917e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f294b523-2ea7-4c1c-b6c4-a84b8fcc8b3b/tenokexajogofetasiba.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49d.bin
239ebf1f2b61f98c25a2c2229852e13e2d7ee4e407661282b8c34d468414c1b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 5148 bytes
font_01_sfnt_off0000f634.bin
48aaec7bcce0c0a24fcd9e7a21db7684ce3e9148c8fb987f37df709bf252b733		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 11020 bytes
font_02_sfnt_off00011bb4.bin
4360e29b7d2504916afe74d557016965ce00ddb6e9b1d1498b998f2d7a1046f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16184 bytes

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