Malicious PDF — malware analysis report

Static analysis result for SHA-256 445a5aa840c5d375…

MALICIOUS

PDF

73.3 KB Created: 2021-03-20 22:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3217a0fbe03c497b98a6afed1e95de17 SHA-1: bed80ec54ea46d0db0323adb7f7e59bdb234b4cc SHA-256: 445a5aa840c5d375c4464de8f6a88f6cb5f5e08f189be7f57149b136f65f15ac
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, vilenefex.ru. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were extracted, the presence of the embedded URI suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/aws?utm_term=catia+v5+tutorials+mechanism+design+%2526+animation+release+20+pdf
    • http://fastcreditreport.info/44440271952me087.pdf
    • http://thelandofbadideas.com/88746087527pkrv5.pdf
    • http://xogavuw.medianewsonline.com/jinupenapavikikosekatad.pdf
    • http://onlineeshop24.xyz/vunuralovovi6nna4.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_600b17fee0db6.pdf
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fcdec6d13803.pdf
    • http://xidasetetobuge.scienceontheweb.net/wavuwejane.pdf
    • http://lalabomujulimof.mywebcommunity.org/9717200114.pdf
    • http://closemaze.com/zofagulipafejudatviph.pdf
    • http://zibikudupe.mywebcommunity.org/78930600835.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_7083bde14dba4ea78bff5175a5ce08dc.pdf?index=true
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_3ae6e8ac3995432081fa6c237dba4a0e.pdf?index=true
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_a6e73570d28e49178da792112b564f39.pdf?index=true
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_dff3a33892ba4ebeb872d4f162a73408.pdf?index=true
    • http://xijewixevav.onlinewebshop.net/tovojigajalu.pdf
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_52077afa07d84348b16d438d6a4b2637.pdf?index=true
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_7d9c830ea7054d1ab69dc476bd047147.pdf?index=true
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_31d516b73893430ab02793baebd2c7f4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d333.bin
ac431022314e07a63f4166e5dff417b81e91f7d842d9e7e6a71e3613ea424b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 5444 bytes
font_01_sfnt_off0000e598.bin
7c354039a64462ed1c2acfa32713f237ea48898db4be9cee8356f73d7209f57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 10152 bytes
font_02_sfnt_off00010874.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 4324 bytes

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