Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0d2495270e5aa3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 07:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae75b0a876b358d1f13d557515f8554c SHA-1: 8fd410790eff825a0b5a1c7fdef75c499c97dd9d SHA-256: 4f0d2495270e5aa30941e39b74aad10c0642796c605ec393ca204a33a234c556
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://falerisztika.hu/tmp/47425717513.pdf In PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/93581695813.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/tejewusugogovixuxibudi.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/xutozomafiweriwa.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/16562272399.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/15644472228.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/gawaf.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/xoguxugiguvib.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/85377732228.pdfIn PDF document text
    • https://viceda.com/userfiles/file/kixesuza.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/60462711260.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/72923365144.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pazere.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jifin.pdfIn PDF document text
    • http://sql110.com/pic/fuposowisusalutixilereg.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f3ce37e8---veduxatefuxutugaxeku.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/mutapolewetiruzubod.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/jexepinufekotojuxeg.pdfIn PDF document text
    • http://coffee33.ru/archive/file/55473572792.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/14169440965.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/18evka5cpolfm72ro8sl6aeqnn/52710840676.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/68480310564.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/livuwidinebaxuwojo.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/48718737217.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/gugoxipasexovofakofef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=epic+store+download+androidPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 19260 bytes
SHA-256: b6f224fba8760d6a7373a6f9b1082ed01604ea3d096e718af4afb78f3c708529
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 10576 bytes
SHA-256: d9e983a671a6f8e4fb0a88ac61dbffac62d9328fd7986043c4b63abfab52fc96
font_02_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1