Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba89d7b89533bb1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-13 08:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f36efc6d280fa5b9174fe50952feedce SHA-1: f5b721a5349924a64a37c6ee36e5cb96cdaf2800 SHA-256: 1ba89d7b89533bb1cc05fad9c9dcac2838736b5f2b218003d5938749d023bec1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the structure suggests it's designed to redirect users to potentially harmful sites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • 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://obrienbuilders.com/userfiles/file/risulotabe.pdf In PDF document text
    • https://egc.ecrom.work/syo/files/jeletujar.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamuga.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/84037917219.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/kagirokijewutomoranaj.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/posewegaz.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/2550257110.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljqn2r40ddhcqup9svl66vrcff/furemogitajurakukenawonax.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/23013557114.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/16572930458.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/vavirubutu.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/69872086251.pdfIn PDF document text
    • http://kechengchem.com/upload/files/12709685399.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/kaluk.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210901103536_402117125.pdfIn PDF document text
    • http://belv.ru/userfiles/file/22144555781.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a67dc265---xapugoni.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/gujike.pdfIn PDF document text
    • http://ahknchem.com/upload/files/36400215539.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/zomuxazuvifasu.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/mepajotupatamu.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/96430651137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chrome+os+free+download+for+windows+10PDF 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_off0000b15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 14696 bytes
SHA-256: 10bfddb68e17891b42f91a9738dd8578e0af71b746fc1486db5d244756b997c2
font_02_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 10812 bytes
SHA-256: 829d32eade3cfa8dab186df1ff49ac5a76a1a5c11e4439071eaed7c7b15b4d44

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