Malicious PDF — malware analysis report

Static analysis result for SHA-256 435953b4ce1fc6b2…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 20:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd5deba0e5b1b39d9e7dae3025c1671d SHA-1: 3eb42e6180c2b93130f7e7776ef70d3d7f2c78fd SHA-256: 435953b4ce1fc6b200c4d4b96625ee1dc2f603889a4f8cdad119af91aa7e72c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms on disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://garglob.ru/uplcv?utm_term=best+graphics+pc+games+2021 PDF link annotation
    • http://kelkenaghshband.com/app/webroot/img/files/35760596941.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77275528967.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/nakufajokizigorutibezipe.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/9839275798.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/31921192749.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135db796c5ec---nenibe.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/24794298555.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/nowipabofoseme.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1v72u0icl3o5uao43b5f7ve873/25235533043.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/titaxab.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/82924203278.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/17583219873.pdfIn PDF document text
    • http://houselandia.ru/files/3723092378.pdfIn PDF document text
    • http://napiarsaigh.com/images/rojegonisov.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/bonoxomela.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/47151250356.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210905095743.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/lafidesalufawodomekupivo.pdfIn PDF document text
    • 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_off0000bbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 17200 bytes
SHA-256: f8ccee47519c322a1359741e05700e2f937c32e6230106a20f894f1895b95279
font_02_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 10896 bytes
SHA-256: aeabf7c74787a6313562e85b9d45bc082e6bd5c747a65d3149c828beee93e44b

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