Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b50f24f8ffe8f5…

MALICIOUS

PDF

69.3 KB Created: 2020-11-11 21:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 56dc4fd07800d1b0d7c7285cdb8a3601 SHA-1: d6bb6005da1ff6a2a5c0b685e7e9395dc97d0227 SHA-256: 81b50f24f8ffe8f567cfa8869a69e37dae72f4c196ff28351b07692dad375947
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 0.9998

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://trafffi.ru/strik?utm_term=valvulas+de+alivio+de+presion PDF link annotation
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/doxilofuwe-vepatitar.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/47191.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/3868b021d7a585d.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/2160229.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/tubafovob.pdfIn PDF document text
    • https://tolazekujulom.weebly.com/uploads/1/3/4/6/134668849/nekobipuvaxodis.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/7ce3f413-b41a-4cfa-a2e2-7428b6846f1c/cooley_middle_school_bell_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/wuzelisibowevakogemer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2057cb74-85ff-4512-9bb2-03e53450775d/lobemeworosolad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91d9be6-a17d-412a-86ad-538f1d87f733/vuzit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889f5a93-f20a-4ef3-830c-9393ecc4ce12/rifanewudurevimi.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/23292034018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10129f9f-3964-40a5-aeb2-885efd162931/michelin_primacy_mxv4_p215_55r17_94v.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_off0000d2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B9 4976 bytes
SHA-256: d03092c11fc62ea784dccb0511dfe233c5661e9af6256c07430438c60c7989e4
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 10836 bytes
SHA-256: 2571c86f13ff75bd15a17c6cdb52e4ae174441952a75fb750753a9e0df3627a2

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