Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24ea934b25f4cf5…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 21:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2594dfb22bbca0eddb9c41a046e59c2d SHA-1: b4a519b8792e3635edc1bc591debec0f917f4aeb SHA-256: e24ea934b25f4cf50d8b22b90eed15bf8d01417d7dd7b3304893a48bd99f0b00
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 prominent URL, https://mezovuduw.ru/aws?utm_term=excel+vba+function+returns+%2523value, suggests a potential phishing or spamming campaign. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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/aws?utm_term=excel+vba+function+returns+%2523value
    • https://static.s123-cdn-static.com/uploads/4404980/normal_5ff85445055f0.pdf
    • https://cdn-cms.f-static.net/uploads/4506131/normal_6039c45f93f72.pdf
    • https://cdn.sqhk.co/jelasusoved/icjhSJH/gisopunifoz.pdf
    • https://cdn.sqhk.co/lozosasuxe/ejaE8Ox/sustainable_development_goals_sdgs_are_also_known_as.pdf
    • https://cdn-cms.f-static.net/uploads/4455375/normal_604a64b88008c.pdf
    • https://cdn.sqhk.co/tajudozizif/gjpheJ7/jokarutil.pdf
    • https://cdn-cms.f-static.net/uploads/4376621/normal_604cf29a98e8b.pdf
    • https://cdn-cms.f-static.net/uploads/4421352/normal_604f4e26d08b8.pdf
    • https://cdn-cms.f-static.net/uploads/4416659/normal_6046212078dda.pdf
    • https://static.s123-cdn-static.com/uploads/4487916/normal_6000a819086ee.pdf
    • https://cdn.sqhk.co/vibisidumes/g3heQOl/download_game_2xl_mx_offroad_mod_apk_data.pdf
    • https://cdn.sqhk.co/puvubuzu/eCJifjj/90604842502.pdf
    • https://cdn.sqhk.co/zivuwimavez/hfhjjhu/chefman_kettle_manual.pdf
    • https://cdn.sqhk.co/revinoxu/dhahRha/98909721027.pdf
    • https://cdn.sqhk.co/nodujugebi/gfZhc5X/sadad_meaning_in_hebrew_of_dorian.pdf
    • https://cdn-cms.f-static.net/uploads/4479684/normal_60343a078ba8b.pdf
    • https://cdn.sqhk.co/kevamubeminu/hbughec/80802421537.pdf
    • https://cdn.sqhk.co/bulegumu/6cFhcFM/guitar_tone_too_muddy.pdf
    • https://static.s123-cdn-static.com/uploads/4471099/normal_5fdf1ec626f4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_0a853343690e4b2c8cb6689d71be893e.pdf?index=true
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_1d3bd4526a9645b48622e3638d28eb25.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e650.bin
ffd4a835c649d8d550b333c76029d7edac20371f4de01d2ebdf90337d4095c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 5100 bytes
font_01_sfnt_off0000f7ca.bin
3a663b0a0112c5adda63345e2bee3bb127e4aa3860b717c115dee03ce0f57894		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 12160 bytes

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