Malicious PDF — malware analysis report

Static analysis result for SHA-256 434f5610ba68108d…

MALICIOUS

PDF

67.5 KB Created: 2021-09-25 22:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2b1a2d7e3c3dd19c2a842c1258b8677 SHA-1: fe10e34f652813434269932f2ae8cfbf669a82a3 SHA-256: 434f5610ba68108d378e84e18c4398a2a16eaa1f3e013f6dc2759a57b06c74c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many of which are hosted on disposable domains and appear to be designed to trick users into downloading applications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3dc3e343b---sekajuterexin.pdf In PDF document text
    • http://modnyi-buket.ru/uploads/files/64462360463.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/85224011203.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/84197319119.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/71282585492.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/zalopenokobop.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/xogopefojekulixolej.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/1674278477.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/detilokizenubovevof.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/68271660122.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/nozomivepaletebuwej.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/zibumiduxegexar.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/91974934090.pdfIn PDF document text
    • http://freetds.net/userfiles/file/widulimikinipapusemezap.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/kerurebivonurexiwakufe.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/67520588345.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/80225539888.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/rofim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+compass+app+for+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_off0000a954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA954 15832 bytes
SHA-256: e87f63af5ef900058d25e7ef311b7316850831f776cf71fbbb893c5f6a18ac5e
font_01_sfnt_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 10640 bytes
SHA-256: ae64b4581e8bc8073de6a688afe06950f20badf916489b31eb2d7b683d828887
font_02_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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