Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2c0875b00b1e5a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 07:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 211b995cb3fde94a1d1a8d2a1adaae67 SHA-1: 25c5c4f20a08a1c6dcdf081d72bf1d3d8780a3a5 SHA-256: 8b2c0875b00b1e5a8471ce5dc3c8c15539c55b6811b104fb839418ac2a02db75
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious sites. The presence of numerous unknown URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://plasy.com/uploads/file/60464966725.pdf In PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zesaduwefa.pdfIn PDF document text
    • http://101balkon.ru/upload/files/81587871028.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/nijabaxo.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/vikumimaranudotuwodaduvo.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/jigiwapivowifuduki.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/folurewefabo.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/17917687316.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/28286735004.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/lewegavasejevid.pdfIn PDF document text
    • https://brod-plovdiv.com/images/wulexopolexovaropupuxed.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210908_47CA29F8E596B344.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/73466919526.pdfIn PDF document text
    • https://anakmeong.com/contents/files/46825728087.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/31830827042.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19b62c42e---moguligavavixogenojefeke.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sababokuvif.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/36716011985.pdfIn PDF document text
    • https://grancom.by/upload/docs/86832395778.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/25868621826.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/37183984041.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/24560586902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=samsung+note+10+wallpaper+4kPDF 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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 11108 bytes
SHA-256: c754fcc1323dd601e6d03742c8011f1c5cd74ee0339fa8946340f03de55d0e97
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 18276 bytes
SHA-256: a66dd87d5a65fbb1f6e2b10b7fa433278a98515b5ee26751a1b12dce98c7d34e

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