Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f4ea8d28f4d72c…

MALICIOUS

PDF

80.2 KB Created: 2021-05-19 02:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94940b662a492d90e9b3312a7287fbc SHA-1: 9988e88efb75f36a6764324174fbbca437e6cfbf SHA-256: f6f4ea8d28f4d72c66caba6cca3655847388c95dcd067e1b73ba648672d92e8b
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although the document body is heavily obfuscated, the presence of the external URI and the high confidence scores from security tools point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=how+to+change+a+sundance+spa+filter
    • https://cdn-cms.f-static.net/uploads/4450340/normal_60383d2377c5a.pdf
    • https://cdn-cms.f-static.net/uploads/4366302/normal_60257473d1dcf.pdf
    • https://cdn-cms.f-static.net/uploads/4404290/normal_6022baab7c6e0.pdf
    • https://cdn-cms.f-static.net/uploads/4407331/normal_60325b1b8e035.pdf
    • http://lejesuxesegofaf.22web.org/kolazefi.pdf
    • http://faketikus.22web.org/gipexejonimudesefota.pdf
    • https://cdn-cms.f-static.net/uploads/4365582/normal_602be4294d42d.pdf
    • https://cdn-cms.f-static.net/uploads/4459469/normal_602ea5677be39.pdf
    • https://static.s123-cdn-static.com/uploads/4420470/normal_5fe5a6cb263d0.pdf
    • https://cdn-cms.f-static.net/uploads/4379603/normal_6067eb3f59830.pdf
    • https://cdn-cms.f-static.net/uploads/4491686/normal_605cfc23e1eab.pdf
    • http://kazidisowefod.iblogger.org/kizuresi.pdf
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5ff783a7030dc.pdf
    • http://wukixijolori.iblogger.org/nuwomoxapu.pdf
    • https://cdn-cms.f-static.net/uploads/4459926/normal_605ad08d7adeb.pdf
    • https://cdn-cms.f-static.net/uploads/4379718/normal_6052519325cfb.pdf
    • https://cdn-cms.f-static.net/uploads/4381297/normal_606a0323e8b14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://puwekaxaxowiza.epizy.com/jufotobojalipek.pdf
    • https://uploads.strikinglycdn.com/files/f5a0e088-d29e-4287-b07f-7dab39335b4a/juzenuzisoka.pdf
    • http://taperimogitunal.epizy.com/pusorezoguxugupat.pdf
    • https://uploads.strikinglycdn.com/files/0d7f4676-3638-4bc3-991a-74b6790ebb25/aprilaire_thermostat_heat_not_turning_on.pdf
    • https://uploads.strikinglycdn.com/files/6ab95170-6f1a-4cd8-ab9c-14f590aedfa9/rafejetugezogagu.pdf
    • https://uploads.strikinglycdn.com/files/850a98b2-dbd0-44a5-a738-74c4fca56bf7/wajabatevowebemifubisu.pdf
    • http://jibipadesubamom.epizy.com/chrome_offline_installer_english.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7a.bin
128806b35673694b0564e441eb6ab2bef79ba442bb33159cb5b3b2b4747059c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 5352 bytes
font_01_sfnt_off0000feb2.bin
316b5bb2fc730f77aec68d8c0d87d6c943efa528cb871905f6ada150a4594a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 11400 bytes
font_02_sfnt_off000124f2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 4324 bytes

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