Malicious PDF — malware analysis report

Static analysis result for SHA-256 3976ff459d43c415…

MALICIOUS

PDF

68.9 KB Created: 2021-03-16 04:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e29b893680262e9ed2f1becac1426009 SHA-1: 3ef9fc48e281b0d63800e62fe1244b5b009cf75c SHA-256: 3976ff459d43c415a472cbb9fd47634e8679584c2563037cba3bc8ec04c0f730
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=our+origins+discovering+physical+anthropology+pdf PDF link annotation
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/c8837c3e2b.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/fupofuwosixa.pdfIn PDF document text
    • http://bipamujiwi.iblogger.org/808_keychain_camera.pdfIn PDF document text
    • http://bamimutekinawaz.22web.org/what_are_the_reasons_for_curriculum_innovation.pdfIn PDF document text
    • http://voralijoxiror.iblogger.org/78986422875.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwibibowow/oieszhi/jetpack_hero_miami_crime_apk_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/bhhx6wE/star_trek_fleet_command_pc_emulator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesapekaf.epizy.com/what_is_mind-mapping.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/44281941311.pdfIn PDF document text
    • http://torumaxot.rf.gd/itil_incident_management_process_document_template.pdfIn PDF document text
    • http://bifobexa.rf.gd/21924023268.pdfIn PDF document text
    • http://duvojawakupo.rf.gd/68039377804.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_d646765bfb404a7d93696ad36612fca8.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_2f0351c5417249389633d7126ab0b40b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/angkor_wat_local_guide.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_e1e7dd3441d944979b8f0761a5fccfc9.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_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 5608 bytes
SHA-256: 88311d7569d516a06a40053bc0342839d22bc4be1c00af3579c95093881192ca
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 10684 bytes
SHA-256: dbaad8e3572b7bde71fc5d976acdb4eb60a3bf7bac097c4c84e52df8b20d09b1

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