Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fa9115fe7b5c32…

MALICIOUS

PDF

80.0 KB Created: 2021-04-04 17:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a994deeede6c8d570524dcd6e579bf9b SHA-1: 5c0cc1a27ea1e29de1d178fe2adfc9e3128ab49b SHA-256: 03fa9115fe7b5c32cce6a58a8f926c47ceba389276a1c39d4b9ef74726550064
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/award?keyword=types+of+adverbs+in+english+grammar+pdf PDF link annotation
    • http://study-english-05.site/fios_tv_remote_volume_not_workingcsl8u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5fe29d83e0131.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/c5Pjjjb/extreme_car_driving_simulator_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fe7703fd37b5.pdfIn PDF document text
    • http://sks-expertiza.ru/minn_kota_powerdrive_55_w_i-pilot__bluetoothzpn73.pdfIn PDF document text
    • http://copyright-central-media.com/best_junji_ito_book_to_start_withxuf4t.pdfIn PDF document text
    • http://chtotakoeverti.biz/machine_learning_algorithms_python_from_scratch1ki86.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/xbjfFkJ/diaphragmatic_breathing_benefits.pdfIn PDF document text
    • http://pubgmobiie.com/angularjs_directive_attribute_without_templatexoe6h.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/D8cihjh/52391479054.pdfIn PDF document text
    • http://ottics.ru/dasexizu30m26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_5fec86e5df597.pdfIn PDF document text
    • http://max-lifting.store/modern_physics_5th_edition_solutions_manualftgbm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5febe5d0a7c1e.pdfIn PDF document text
    • http://net-klientov.ru/213210554858lbap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6037614ef0693.pdfIn PDF document text
    • http://getcreditreport.info/how_to_clean_a_winchester_model_94ael044h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_6a12b30000f540c78b0b8d070ad947fc.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_8b1604f30b9d4169b6fa6fa0cb06d3dd.pdf?index=trueIn PDF document text
    • https://51364a6b-283d-4537-b9df-48522fd8faf2.filesusr.com/ugd/921180_0c6f31e336e14a8a94023577d2f2b367.pdf?index=trueIn PDF document text
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_eb7940b5a4764be1a36264f00a5ea363.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afa4710-eead-4be1-b52b-e2c70fb7f0a4/45870830564.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_81aa28e216a14364a4e150618080cf9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa0670e-53ad-496c-be00-d013984806d6/nativity_play_script.pdfIn 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_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 5704 bytes
SHA-256: 3bc7d27f9208764610422bd215188c38d3c598d4ac4c212b6d14bb2c05675143
font_01_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 12256 bytes
SHA-256: e4dd90c0c1716a07dbc2008b754297ccb0fe791f7694e080af78a6b8a8a16c49