Malicious PDF — malware analysis report

Static analysis result for SHA-256 426a481e8e9ce116…

MALICIOUS

PDF

87.8 KB Created: 2021-04-01 01:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f46f71e07d4888dd52aa100eabb64303 SHA-1: 8bdd5d7ac3d45c383e1eead8d17f60faf0ede7b9 SHA-256: 426a481e8e9ce116af2b3b53b89c8bfcd47a6ad2c37e8090c44c0acab4199e57
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site for further exploitation. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=rate+my+class+psu
    • https://cdn-cms.f-static.net/uploads/4471236/normal_603f5f3c4e6b5.pdf
    • https://cdn.sqhk.co/dukapudubi/jbih6ji/nakapexopojilebukanini.pdf
    • https://cdn-cms.f-static.net/uploads/4458124/normal_6064e9844433c.pdf
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5ff007053a335.pdf
    • https://cdn.sqhk.co/kutupejotige/ijhetgj/92249757032.pdf
    • http://webcam-model.online/sadorinofitabuxobilozafk4rb.pdf
    • https://cdn.sqhk.co/madilaxetevo/jb7FDge/construction_cost_plan_template_excel.pdf
    • https://cdn.sqhk.co/fuvebopeweb/KPnjhje/xinisuzalarivepetejo.pdf
    • https://cdn.sqhk.co/dinigivo/ifspgdJ/rokagan.pdf
    • https://cdn.sqhk.co/tomijupef/dhf8vtX/74082576934.pdf
    • http://ginupedarokuxu.getenjoyment.net/bentham_utilitarianism.pdf
    • http://molotkov.site/antigone_massimo_cacciaritxy6m.pdf
    • http://idealica-ufficialeitalia.website/pokemon_go_community_news_twittere80b3.pdf
    • http://filanion.online/250742457119e6ug.pdf
    • https://cdn.sqhk.co/fovipobex/hdggdr5/lesson_plan_templates_for_esl_teachers.pdf
    • https://cdn.sqhk.co/tokofape/PgdhSgd/ates_ve_su_2_oyna_oyun_skor.pdf
    • https://cdn.sqhk.co/ramojezi/hicjaC2/gunesateb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pimimozoji.myartsonline.com/job_application_form_for_mcdonalds.pdf
    • http://sivikonalijuto.myartsonline.com/jevedunozigejalimo.pdf
    • http://seroritubofa.atwebpages.com/probability_sampling_journal.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_off00010c85.bin
906946e09e92ff97184e173ded81053dd03c8fa52c1268b6315076e48275fb08
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 4708 bytes
font_01_sfnt_off00011c9f.bin
ca180ebff59b983af8bb48ef456d96bd861306162921c11a1240ae8962f341c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 11600 bytes
font_02_sfnt_off0001440b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1440B 4324 bytes