Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99e33d06a9d7c97…

MALICIOUS

PDF

65.3 KB Created: 2021-06-02 07:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbc2cd62218944e47b608b144d3a4cbb SHA-1: 7e5b04169f7fa6a3f39a5d7336616ec77e211761 SHA-256: a99e33d06a9d7c9759e9fe33851a2de4093c5a7a1cedfc08e988669b3de7f70c
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9263

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
  • 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
  • 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://archism.ru/pbw?utm_term=advanced+mechanics+of+materials+and+applied+elasticity+pdf+download
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/377f5a.pdf
    • https://cdn-cms.f-static.net/uploads/4493867/normal_604847ce753cd.pdf
    • https://vopukuno.weebly.com/uploads/1/3/1/3/131383764/3526102.pdf
    • https://cdn-cms.f-static.net/uploads/4376609/normal_6019d5784bc3f.pdf
    • https://xurigaguk.weebly.com/uploads/1/3/4/6/134635426/bigufozakagufen-kipiwosu-pilon.pdf
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/vixedezalore.pdf
    • https://zakisegozazamig.weebly.com/uploads/1/3/4/3/134346543/1563104.pdf
    • https://xitititoludazo.weebly.com/uploads/1/3/5/9/135987602/4673245.pdf
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/ranasib-kelabigowij-duginotimuvod.pdf
    • https://cdn-cms.f-static.net/uploads/4369640/normal_601ecef325967.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luwivaj.pbworks.com/w/file/fetch/144487242/pusadidobudulivobajetesaz.pdf
    • http://jizakatum.pbworks.com/w/file/fetch/144494292/dragon_ball_z_shin_budokai_6_free_download_for_ppsspp.pdf
    • http://katafuzum.pbworks.com/f/netifiverexeruvijap.pdf
    • http://wiliser.pbworks.com/f/how_to_get_a_false_negative_on_a_dna_test.pdf
    • http://palixazoke.pbworks.com/f/how_to_connect_denon_heos.pdf
    • http://mapijakemifo.pbworks.com/f/lebad.pdf
    • http://sijomirurefi.pbworks.com/f/jevebikukaxavara.pdf
    • http://lebunurivugu.pbworks.com/f/varorofusuxin.pdf
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144493209/helping_verbs_worksheet_for_grade_6.pdf
    • http://watusuxipidu.pbworks.com/f/22067944835.pdf
    • http://siwuromo.pbworks.com/w/file/fetch/144425184/65874951734.pdf
    • http://visetululiv.pbworks.com/f/stick_fight_archer_mod_apk_unlimited_money.pdf
    • http://liwuvedesisu.pbworks.com/f/how_to_find_diameter_of_a_circle_when_given_circumference.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfaf.bin
3c2953600b4186222bb95c2cf5f99bdb1db1a3e6416225498d433b6bf2f3082d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 5636 bytes