Malicious PDF — malware analysis report

Static analysis result for SHA-256 43277583dc4af8e4…

MALICIOUS

PDF

69.5 KB Created: 2021-06-07 14:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 663d981c58d80125f4b973740171d1e2 SHA-1: 83759cb1f86203359d4cf327ade04bb076b855d1 SHA-256: 43277583dc4af8e44d9268489de145e21cc8150ccae262a8ce0720abd50e28f3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crysiq.ru/pbw?utm_term=angle+of+elevation+%2526+depression+trig+worksheet+answers
    • https://bematurom.weebly.com/uploads/1/3/4/8/134886193/add3df2635455.pdf
    • https://fiwaxajosikevi.weebly.com/uploads/1/3/4/8/134885015/riwiremabodiwen-daxerugaz-wuzewizelidij-jilopevig.pdf
    • https://cdn-cms.f-static.net/uploads/4450630/normal_6056cc46a6152.pdf
    • https://zaxanedipujez.weebly.com/uploads/1/3/4/5/134582154/wixidemite-josebajefipib-gumegamuf.pdf
    • https://cdn-cms.f-static.net/uploads/4468554/normal_5fe97ff412c91.pdf
    • https://cdn-cms.f-static.net/uploads/4386621/normal_602e4bb186bca.pdf
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5ff783f8c9a20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://devopiporo.pbworks.com/w/file/fetch/144737205/fixiximevatujefubuparom.pdf
    • http://junerew.pbworks.com/f/arkansas_drivers_test_study_guide_2018.pdf
    • http://sawanixum.pbworks.com/f/diep.io_mod_apk_unlimited_health.pdf
    • http://wiwedano.pbworks.com/w/file/fetch/144427302/how_to_prepare_moringa_tea_for_weight_loss.pdf
    • https://uploads.strikinglycdn.com/files/1e10758f-ed3c-413e-a34f-816c0902042b/big_george_foreman_rotisserie_grill.pdf
    • http://xugilip.pbworks.com/f/simultaneous_equations_with_fractions_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/7baa4179-6487-4cfd-a375-b8e53afab997/dusk_of_dawn_summary.pdf
    • http://lagawiwefe.pbworks.com/f/xebelaso.pdf
    • https://uploads.strikinglycdn.com/files/451a9da1-3710-448a-a372-066fdc54641b/numolubipogudozuju.pdf
    • http://lexibitite.pbworks.com/f/58449801851.pdf
    • http://jitilabajeko.pbworks.com/f/revivir_huawei_p8_lite_android_6_flashear_ale-l23.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d441.bin
2ad0249f3884aa9ea2e5f0b91d8bb6b61d1f61c0a3fad29f13a95fcacd1dc477		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 4708 bytes
font_01_sfnt_off0000e46d.bin
ac49f77f2f609d3b99e3442f47cd281a1723c30929301df337b2a9a59e3dcf88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 10608 bytes

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