Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e08249a8802d86e…

MALICIOUS

PDF

73.7 KB Created: 2021-03-14 02:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a0b46e998034eea5d32f11c6a11fd49 SHA-1: 14438158ba857778a66a351c6c6f5e7efdc1dcd4 SHA-256: 3e08249a8802d86e144617724adeea5160e40fc99df9723ea821e354175db8e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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=how+to+program+s30-s1b+remote+to+tv PDF link annotation
    • http://savigekefove.iblogger.org/spectrum_analyzer_software.pdfIn PDF document text
    • http://wilexani.22web.org/wulepotipezozojowike.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/6a79e3b4-dfed-4e16-a4ac-0b4f734e446c/company_of_heroes_2_complete_collection_trainer.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/ketoacidosis_treatment_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/letunubegidemedirujef.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_d48f2233a3544a9d99e12d64e304601a.pdf?index=trueIn PDF document text
    • http://rivowotow.epizy.com/93995281161.pdfIn PDF document text
    • http://defapubatalu.epizy.com/biophysics_course.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_ad0508169965403fb3b5715903e47a24.pdf?index=trueIn PDF document text
    • http://fozidunaleral.rf.gd/16041434026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7c0313-c7ea-43fe-ab0a-85b28e617073/bapakaxipiditabodad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9047ae44-8e43-4d5b-b6aa-954a4648c12f/nefomasok.pdfIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_b3e1dd924465434a8fd057edf30252f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potamotaz/724729894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6cf528-84db-46bf-883c-1028b122b301/how_to_update_factorytalk_view_studio.pdfIn PDF document text
    • http://pivexim.epizy.com/comentario_biblico_contemporaneo.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/que_es_balance_general.pdfIn PDF document text
    • http://kilatigavof.rf.gd/nipazasitax.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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 5748 bytes
SHA-256: d6163c3390fad3a9aed53185cffe4f3e40b159db68092ad0d12fe53f6b6f746b
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10564 bytes
SHA-256: aafcbd054d81bf7c492c68371c70288e8559f0b714c6b4e39a8e1014db1cc2f6

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