Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b75fa9f7a0b5ae…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 19:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad20a0e380fb8c6387041b11ed9e6cc SHA-1: d3ce91cf3dd2d481768c8b6c8fd05920c5e4abab SHA-256: 50b75fa9f7a0b5ae7671a892b101399eec16b0502163267df3d4675d96668878
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the document is designed to redirect users to malicious content.

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/123?utm_term=unbreakable+movie+english+subtitles+free
    • https://cdn-cms.f-static.net/uploads/4468268/normal_5fe7f604aedc9.pdf
    • http://sidikapefujuxe.22web.org/noximodutif.pdf
    • https://cdn-cms.f-static.net/uploads/4500674/normal_603712266d215.pdf
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fdf99166848f.pdf
    • https://cdn-cms.f-static.net/uploads/4486353/normal_600bd5fdb4051.pdf
    • https://cdn-cms.f-static.net/uploads/4495997/normal_60225311d73c2.pdf
    • https://cdn-cms.f-static.net/uploads/4409610/normal_5fd9e8e2ca366.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dowavelaxam/secure_folder_samsung.pdf
    • https://uploads.strikinglycdn.com/files/be6561ef-036f-4efe-9ee8-e1f09fd8a602/67802720516.pdf
    • https://uploads.strikinglycdn.com/files/2211195e-c1f3-4883-9038-fb79d08d3968/rt-ac86u_review_smallnetbuilder.pdf
    • https://s3.amazonaws.com/zatasipezeg/windows_7_usb_dvd_tool_program.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/29913395311.pdf
    • https://s3.amazonaws.com/zozofufulolig/4901604712.pdf
    • http://pimifemegizak.epizy.com/after_effects_cs6_getintopc.pdf
    • http://firiveperoju.epizy.com/tubilejidak.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/13336371079.pdf
    • https://s3.amazonaws.com/sizabo/acknowledgement_format_of_project.pdf
    • http://funuduki.rf.gd/formasi_penerimaan_cpns_papua_barat_2018.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_off0000ebde.bin
c3b80442b0c805e4a2e68857e307ced4187437a563782ee6deb60332bf5c8f29
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 5436 bytes
font_01_sfnt_off0000fe40.bin
88931f742305942105bfb1154dfb858893a3432add697bca85040596dfec5df0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 10896 bytes
font_02_sfnt_off000123a5.bin
1b70dec67b14d8356ed17f2c1aa1eb71d784c5459b687843903ada8fa53c5842
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 16224 bytes