Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe8ba8c00170d6e…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 17:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 120745b3aba7eaf0bece910b6bbb89f9 SHA-1: 592443fa0d86ebf01ba8532240f0384ffb2e7b11 SHA-256: bfe8ba8c00170d6e523df47e8bb6d14d735b9c4b98a56c8f65ab93789265e12f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=polymyositis+in+dogs PDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbbe18de2---21914638445.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/rilawilupologufabomixawu.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/23797106769.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/puxififebegezivefek.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/buxit.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/4095022360.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/liwowutojema.pdfIn PDF document text
    • http://e-sportis.com/images/upload/xevijexugizeduxu.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050433041144.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/99866283875.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/siparilurefuropebazeget.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210925175435_6exgax.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/lonafozavudekamumeseperon.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210901212135.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/koguroviwinomenol.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-11/20210911043834957886.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/56870805988.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/vedorebusesazobopigaxu.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/biroko.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/sebukazasetijos.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/bewasoximes.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/79696010254.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/87729669378.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_off0000aed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED5 15904 bytes
SHA-256: aa43697acaffa0e8a82b105064f78f3b3d64aff98f1504ebc84f33c973303426
font_01_sfnt_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 10312 bytes
SHA-256: 1d9d5f064faf2c23355ef380269687271ed6cb75ccc2f3d0921b42a30dfac811
font_02_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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