Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca947e4899ba52a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-08 01:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4704c8bd614eac34a0ebc5a9587118a4 SHA-1: 69ed017802db229542bb4bc5204228b54dc42fb9 SHA-256: 2ca947e4899ba52a2fb77158798e4d42620e97a20b42ef9981b4751fa7ec9d59
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to legal definitions, which is likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://kuzutuzo.ru/strik?utm_term=definicion+de+derecho+procesal+civil+en+mexico
    • https://cdn-cms.f-static.net/uploads/4471099/normal_60275c49c8fb7.pdf
    • http://podenepusow.22web.org/case_studies_in_nursing_ethics.pdf
    • https://cdn-cms.f-static.net/uploads/4478946/normal_603272256b8a5.pdf
    • https://cdn-cms.f-static.net/uploads/4386354/normal_602454dd0f4ce.pdf
    • http://sodahq.club/zixatojadezudagiruluwhyv67.pdf
    • http://mivibowefumar.iblogger.org/11483378845.pdf
    • http://visiblawty.com/aula_internacional_1_audio_cd_free3ukiy.pdf
    • https://cdn-cms.f-static.net/uploads/4462730/normal_60411aa397857.pdf
    • http://idealicaitalia-official.site/how_to_clean_original_keurig_with_vinegar46bfa.pdf
    • https://cdn-cms.f-static.net/uploads/4371020/normal_60207e82e4899.pdf
    • http://kabosimoligobe.iblogger.org/student_centered_learning_theory.pdf
    • https://static.s123-cdn-static.com/uploads/4366316/normal_5ff97c396e94b.pdf
    • http://betmoy57.com/nuxubilurizwom5.pdf
    • http://modusebipiz.iblogger.org/kiromi.pdf
    • http://blankid.ru/vilavowusegm15g.pdf
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5fd7ebe95f43f.pdf
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5ffd4c1cc7d63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sutazobizomobuz.rf.gd/manual_para_hacer_aviones_de_papel.pdf
    • http://divamepirinati.rf.gd/95039265851.pdf
    • http://dibirat.rf.gd/emergency_reporting_phone_number.pdf
    • http://tosememab.rf.gd/66562877728.pdf
    • http://tamegebodow.epizy.com/62219773112.pdf
    • http://pofizobeje.epizy.com/43505385841.pdf
    • http://bipolewajavovad.epizy.com/reweravaruwajigedame.pdf
    • http://rurobudono.rf.gd/57467360328.pdf
    • http://wamitut.epizy.com/hepatitis_autoimmune_guidelines.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_off0000f52f.bin
77dc4b19bf48d7fc5c3d4a1675e8ec561b47216ef9e2f2e735f4c37c3a7f3f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 5524 bytes
font_01_sfnt_off000107e3.bin
36c2b684d189242d98e21d9d45881984abe8e9e64612122129d7292df688638c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 11968 bytes

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