Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9e1416951bb953…

MALICIOUS

PDF

75.6 KB Created: 2021-05-25 00:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 66ee012e5ed23c3d8e5b49780adf275a SHA-1: e00c526cb10bfed7ff7d8b710c9c9ccaf0e1a402 SHA-256: 1f9e1416951bb953dc06a3f2cd253e2dc36ba86e1e3744bf1fc68667599537f7
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded URI pointing to a suspicious domain, 'baarspo.ru', which is likely used to host a phishing page or deliver a second-stage payload. The document body is heavily obfuscated and unreadable, but the presence of the malicious URL and the high risk score strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+is+the+purpose+of+agarose+gel+electrophoresis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426823/normal_605f8c6f1f6d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5ff15da9353d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_6027b0b9388ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476274/normal_5fda4a3745b63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_605f59e19732e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457563/normal_5fc60fb7898ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500440/normal_5ff304ab24dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5fd78c85d24e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411709/normal_5ffd6e3a28c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_6047b46d452d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_601fe05240220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_5fdbc90f10a77.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/lokijuronig/ioi_downpour_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecac73e-8f3c-478b-ad83-c05e5181ba50/c_programming_from_problem_analysis_to_program_design_5th_edition_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/dubevuw.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/24808804029.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/40513016228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9618e3a-c3fd-433d-8b65-2cd3311dda92/la_leccion_de_august_resumen_personajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f9050c-ba2d-4724-b1e5-2526741b51eb/oil_furnace_heat_exchanger_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/asus_usb_bt400_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfdc2e3-e1a5-4a9d-a2c1-3d9bdcb517ff/instructions_for_boots_pregnancy_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ba266b-9815-4c50-8916-b20e640c7d3a/gavivugu.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/85421902732.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/4651993663.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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 5288 bytes
SHA-256: 14bc5c6eee148f009c952b1efeac9c68d60d83b6edc8c078289f3a315d899a36
font_01_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 10860 bytes
SHA-256: 83a09eb02bbcf599160a67ed46b13be19468c8d3c19866ae9db56f40a9ee2b14

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