Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a61a8276fe9301…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 18:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b1d035e92f9737398ca638bfa6f4ede9 SHA-1: a9f00b508ec3a2141b59c5297cec665075a0d7db SHA-256: 66a61a8276fe9301ea5422923fbc66955208e46cc6688f60138376c480be299f
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 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vrzion.com/data/userfiles/files/mefelalan.pdf In PDF document text
    • http://bbmeti.it/userfiles/files/rivedutobebojele.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/talagofavusivigejovuzil.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vufeduzigoxepi.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134e96e0a13f---kevamowilivobukupu.pdfIn PDF document text
    • https://ms02bet.com/contents/files/10328155824.pdfIn PDF document text
    • http://mosjob.ru/images/file/sejotaweku.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109032121182403.pdfIn PDF document text
    • http://warehousetraining.ie/images/5602098933.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/jagulumipusaxomosa.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/lupogewumel.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/13825678697.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210913205821.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/kibebafuveter.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/14992758986.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/61444283574.pdfIn PDF document text
    • https://epiphanych.com/images/file/patubatubidu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/afd34cf78ec1875f46ea69c7fb1eaae4/26540834536.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/61678997303.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/taxotuxaraxugibuvifa.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/kusowukamunazul.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/pobeluvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=themes+app+for+android+free+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DB 10712 bytes
SHA-256: db8363a218d3768ad20275376b0ee67682627859dbb28dc076210f9f745d6532
font_01_sfnt_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 16676 bytes
SHA-256: 28c22193fd72fe252ba6cfcf5cf9b7f86728c0592ca80a9df9f4296e731732bf
font_02_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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