Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b7195d472f4755…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 16:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59d47ca58203e28ed923061f524a7d00 SHA-1: b2e080e7b685c98b7cf457f938bf9552ae53c800 SHA-256: 51b7195d472f4755a5c61559b070ba746dbe1c39677b098ecd1c3190fadf762c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, containing numerous links to external PDF files hosted on various domains. The presence of multiple disposable or unknown-reputation domains suggests an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://vidiniaibreketai.lt/userfiles/file/30442182236.pdf In PDF document text
    • http://csc-028.com/userfiles/file/20210902035538_l2cuod.pdfIn PDF document text
    • http://iucecb.com/files/file/66724445898.pdfIn PDF document text
    • http://megalaserasia.com/upload///60292613657.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/terodivunovavaberaru.pdfIn PDF document text
    • https://kapefashion.com/files/files/57691109099.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/18159838817.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/41462884227.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/vukaso.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6141b3ce301d1.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/71652242151.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/67553853051.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139717ff30---94093385744.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/36408733218.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/wavakemivofarujewi.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wawesidomogerajikezaji.pdfIn PDF document text
    • https://aildf.in/userfiles/file/73850306760.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/ropatugalogosu.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/rirunevifafojuzuxixam.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/91468721829.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/gazar.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/44550963343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=displaysperre+deaktivieren+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_off0000ac80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC497 10656 bytes
SHA-256: 645033a1cd4a71d3394a2020ffa9b574b114dc7ac76f2a1a46a5717a44de3726
font_02_sfnt_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 15052 bytes
SHA-256: 7801f058fdadd27661b948073179a98a0f0151f4b3b7a5d0b0343105cc33cb13

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