Malicious PDF — malware analysis report

Static analysis result for SHA-256 161a55c543e1979b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 15:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d22d1b17a40ae04270989480d3f772e SHA-1: 0bbd4a2a8661ff6406ef5ac39cedc84ebf74bec4 SHA-256: 161a55c543e1979b0414c3c62480214c412c334c7b994e3be172fb36aa3d1f00
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://ketchas.ru/uplcv?utm_term=satisfya+song+download+mp3 PDF link annotation
    • http://iweldbot.com/ckfinder/pho/files/81861132162.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/75699267393.pdfIn PDF document text
    • https://securitydm.com/slicice/file/70477027251.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/53880252681.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/tadixowapuropedereki.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/49919983120.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/18944124436.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/98945280345.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/mesarukukumumatut.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/88928378203.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/geriwuti.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81565432863.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021914924105737.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/noxoxajevobejozo.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/22566129487.pdfIn PDF document text
    • http://kgmda.com/upload/files/14621629782.pdfIn PDF document text
    • http://gibisch.com/files/files/xerigugusinumepe.pdfIn PDF document text
    • https://trainova.com/userfiles/file/tofaliwotorer.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/purof.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142210ca31f3---79748383283.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090217235712.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/97955560621.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_off0000b553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 15520 bytes
SHA-256: 0e4167e236e717a6326f752cd8a92c8cca5aec376d5c07bef7ebc9f3e6f5e256
font_02_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 11056 bytes
SHA-256: 74c6313882206109b90f989f61a1675e21c3ec90660a0916524a52c6d4fe7498

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