Malicious PDF — malware analysis report

Static analysis result for SHA-256 c389ab154f76137a…

MALICIOUS

PDF

94.4 KB Created: 2021-03-06 14:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f81f0326bd70aa36a57764c1d318a938 SHA-1: da2db42a91495b11c38f05e99aa6e0c4866ce364 SHA-256: c389ab154f76137a4f6bd65ccb0e817f6b142091b713cc8d91bff4ceabc934dd
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to malicious sites, specifically using a search query as a lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL points to a domain associated with phishing and malware distribution.

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/strik?utm_term=what+is+the+meaning+of+self+reliance+in+sinhala PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420608/normal_600b46ba50c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_60264e2a59f3d.pdfIn PDF document text
    • http://pugalibapuf.iblogger.org/52787101175.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/wozavonejoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fd3afb25733d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_6031122715174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c71b1e8-570d-4a1b-9274-28be44bc8539/lidejowirutef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9795e6-fcfb-4b83-80d7-0f56675bc838/buzuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27818983-64f3-49a9-8d89-7dc5d3c2b8de/wupejemujuzajobupidami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b175a7-d9ac-4142-ba69-a827c1583514/xodojamovuniwimelutevuful.pdfIn PDF document text
    • http://zilenidebu.epizy.com/publish_xunit_test_report_jenkins.pdfIn PDF document text
    • http://zoregok.rf.gd/53366991410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68058c39-758b-4b7e-a645-b4b32bf58ce8/54362585806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe77de5-0631-465a-aa90-7bca757e344d/how_to_calculate_radius_on_google_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d422672-5929-42af-bfc1-3daa8b3ea312/bird_with_yellow_feet_and_beak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89a5771-f208-41d7-a4db-bef2e3234d76/singer_4423_sewing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ae28e6-5088-4970-ab2c-55fea5836803/how_to_use_electro-tek_digital_multimeter.pdfIn PDF document text
    • http://kuzibawo.rf.gd/acrobat_pro_free_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbff7e0b-b4b7-4279-bcc7-98fcbe698476/57851772534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a679ea6c-4403-4dbc-a5c7-d8f8910990f1/betagivote.pdfIn PDF document text
    • http://fajamoluw.epizy.com/topubiwulekaluvubigolem.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
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5308 bytes
SHA-256: b8322e2f0a146457fc9a8004ac539921bba982930abc56476991f9a9aaeb0e34
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 28424 bytes
SHA-256: bec7ff0b9bbe15feeb2c1efa41d07523b12c8cb2dd955a5ed46e15843fe3f261
font_02_sfnt_off0001379a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 1712 bytes
SHA-256: 21e08c9e098e8ef01b329287e9efef18d21ee9a274f8fe04589064eb316b9f9a
font_03_sfnt_off0001401f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401F 12488 bytes
SHA-256: 009181325c028320518a25e936ee35388e9b56878aefd40dbcc37e526899ad41