Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba245c0a44bad5e9…

MALICIOUS

PDF

75.2 KB Created: 2021-03-14 04:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88abef9738f2746952bf78b3f7214d2f SHA-1: 2bc332dd9dab8f3a0ccc43738c10de612ce70fa0 SHA-256: ba245c0a44bad5e907035ba1a510aa939cacdb87feecbb15148abd7b56e0b80b
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a potentially malicious website disguised as an answer key. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of an external URI is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/wix?keyword=quantitative+energy+problems+part+2+answer+key
    • https://static.s123-cdn-static.com/uploads/4467004/normal_600314e11a84b.pdf
    • https://cdn-cms.f-static.net/uploads/4419192/normal_604aa5080d82e.pdf
    • http://vostokzapad.su/zasixubatapigulifq5t1j.pdf
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5fe8986e203ef.pdf
    • http://lunesygets.xyz/new_amsterdam_tv_show_episode_guidexloet.pdf
    • http://kupivse.xyz/82921449313t8667.pdf
    • http://retys.fun/basketball_court_diagramsf1yr3.pdf
    • https://cdn-cms.f-static.net/uploads/4393647/normal_60219ca7324ca.pdf
    • https://static.s123-cdn-static.com/uploads/4454438/normal_5fe397e36eab1.pdf
    • https://cdn-cms.f-static.net/uploads/4470985/normal_5fd9a6274311b.pdf
    • https://cdn-cms.f-static.net/uploads/4381091/normal_602437dac7d03.pdf
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6009d2a805a32.pdf
    • http://samo-katim.ru/25943797840yuz7l.pdf
    • https://cdn-cms.f-static.net/uploads/4447250/normal_604796d2701a3.pdf
    • http://nuwevabufa.mypressonline.com/kosetisipejumuwexuvusi.pdf
    • https://cdn-cms.f-static.net/uploads/4453332/normal_6032881b36906.pdf
    • https://cdn-cms.f-static.net/uploads/4388422/normal_600a446116cfc.pdf
    • https://cdn-cms.f-static.net/uploads/4457848/normal_6013264de9274.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wipotegadodorek/topusidiritisi.pdf
    • https://s3.amazonaws.com/dadupawo/skills_gap_analysis_report.pdf
    • https://s3.amazonaws.com/wiwuxot/urosepsis_guidelines_2017.pdf
    • https://s3.amazonaws.com/gadumagabusodel/teamwork_skills_definition.pdf
    • http://benamow.myartsonline.com/bakalixiraxes.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_off0000e7e1.bin
ae0123099136ea112a44dd845e88506359afbb749d7de5c04b6f0e4d510c1a96
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5788 bytes
font_01_sfnt_off0000fba2.bin
89c999f7ef0e65a5dc0e241f9787634a3e052de2c32651884c7019e1f8a377ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 10360 bytes