Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4b9fc727fbff17…

MALICIOUS

PDF

80.2 KB Created: 2021-03-29 07:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 36da579c0692d8120e6a8c0cf0c5445e SHA-1: a0f44002c0e8b79f722dc5672d66c258cecd1488 SHA-256: cf4b9fc727fbff17caa69b6a1be291cc130e4c1fff8dc184e3ab69267bb78e38
126 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ML classifiers and ClamAV, contains numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, appears to be a lure related to 'gambar sistem pencernaan manusia pdf', suggesting a phishing or scam attempt. The presence of multiple disposable hosting links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=gambar+sistem+pencernaan+manusia+pdf PDF link annotation
    • http://hydraruzxpnew4af.exchange/commercial_electric_m1015b_continuityvcbvx.pdfIn PDF document text
    • http://tryraisins.club/53253513680vz87a.pdfIn PDF document text
    • http://wowmarket.info/balada_unui_greier_mic_george_toparceanu46hm0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479212/normal_602c4c70385a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_5fe70769466f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_600914e79de80.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/jjipcie/matefodugudiripikel.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/djikjhK/dokdo_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/tdigijc/2636114897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_6034dd29963e0.pdfIn PDF document text
    • http://itdiscount.pro/zepurajijaxovefifiraklonp6.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/s0ifB0I/povaw.pdfIn PDF document text
    • http://cparta.moscow/69373960351kwezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/consent_form_for_nsfas_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c030e3-d094-4a1c-92d9-09933b28e7f0/biologia_celular_y_molecular_de_robertis_16_edicion_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a41b4f-f684-4776-bcea-4cd62dc3850e/69349729160.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_db804272587c4e3a933e96dbdead513b.pdf?index=trueIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_9f8ce608a81045298b8e828fc2678f46.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_167174a0e5174e5ea86a2a9d0706e739.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resisuna/veiled_chameleon_diet_sheet.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_13a9e1f59b0b45f682ba7dfbb57eedd3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 5440 bytes
SHA-256: 1961815bbed1414b93c1b2834393d5b91e1d8debe40cc5a9f695836fa030c149
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 10040 bytes
SHA-256: 7bc244ed113405da282160ee877e54fdf5ad5de9ab1f09b4b27ffad87bdc9215

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