Malicious PDF — malware analysis report

Static analysis result for SHA-256 91338fe4ddfc12e7…

MALICIOUS

PDF

68.6 KB Created: 2021-03-23 23:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd6c60ca834f3a8fb5dfa60a4f626f19 SHA-1: 1017a774ab91c29565fee0d88b6eadb90184625e SHA-256: 91338fe4ddfc12e718ea1aac3c51d3b44915484505ac31acb7b824eae9b44a15
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a malicious payload or redirect the user. The document body, though heavily obfuscated, suggests a lure related to a 'study guide'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/wix?keyword=ss8h5+study+guide
    • https://static.s123-cdn-static.com/uploads/4485152/normal_5fc5d32690662.pdf
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5feb0fb4ed3b3.pdf
    • http://fenopageliterow.iblogger.org/how_to_charge_one_600_polaroid_camera.pdf
    • http://bostpolamos.site/lawasifimebeleduzuvl37zv.pdf
    • http://eu-study.ru/what_is_vegan_at_el_pollo_locog70c9.pdf
    • http://hardcreditcheck.info/real_gdp_per_capita_and_median_male_incomeq2ez0.pdf
    • http://naturebiolog.fun/49893245461qzyd1.pdf
    • http://im-marceting.site/42705213910mvgbq.pdf
    • http://tryraisins.pro/gokuvodafenegobatiguxivo7yyrj.pdf
    • http://firstreadersclub.com/is_bella_a_good_waffle_makerp7w73.pdf
    • http://nudazizefa.22web.org/suspicious_activity_report_form.pdf
    • http://natlab.ru/fundamentals_of_database_systems_solution_manual678y4.pdf
    • https://static.s123-cdn-static.com/uploads/4410013/normal_5fdd946711210.pdf
    • http://basepati.22web.org/report_structure_year_2.pdf
    • https://cdn-cms.f-static.net/uploads/4417213/normal_6015db15c0e15.pdf
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5fcbf8faf406e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_43c8a7f32dfa4c77901733068c0ab2b8.pdf?index=true
    • http://zomimek.epizy.com/cbse_net_jrf_application_form_2018.pdf
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_5adf5968262c4d8e9aac347def56854d.pdf?index=true
    • http://nuratijuwatag.rf.gd/54528182019.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_83fb8fad06da467181d0f1bd20038439.pdf?index=true
    • http://karifopiti.epizy.com/62714714799.pdf
    • http://fukovaxirukaxa.rf.gd/66016929003.pdf
    • http://koxikid.epizy.com/97764088463.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_off0000ce8e.bin
6426cb4d2b899b69c18c2208311cc6ee0e66855a2884062e18a0708602420ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 5272 bytes
font_01_sfnt_off0000e086.bin
c31ce3de1903aeba9a682de036fa83cb6de41959d52b7e202dd9e0ba52e0a7fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 10868 bytes