Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d59ebb8245166c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-12 21:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a022cd6ef3c4c853f4075ed7eac670fe SHA-1: 3ee9e1a961894ef71fcda858d277705974a6c394 SHA-256: b7d59ebb8245166c99933f0714ea5be12ee809835173ea1d6fadcf900dde15c1
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, many of which are unknown or potentially malicious. The presence of external URIs and the link farm structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://winhazel.com/indigo/ckfinder/userfiles/files/nizokarap.pdf In PDF document text
    • http://kfoodntea.com/dataroom/file/6835177896.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/nojuviparapujegegepojepi.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/91158561131.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/menodexugojole.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/56888354027.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/reginepewosizadupuwe.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/00d45a450a4636f51d2c6fe5c2f019f1/82687952656.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/velawimexijesala.pdfIn PDF document text
    • http://liyangah.com/Upload/file/5952484178.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/29479537155.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/bosubaxomujejepu.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210901200118.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/64932916802.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f651b161---36301463335.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/fexakevidokepe.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/79311427954.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/nakilogut.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/40618907069.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4388984b---vorezegimaleviwukudotivi.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/24275748978.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/buwimevixira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=internet+protocol+osi+layerPDF 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_off0000b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28B 14624 bytes
SHA-256: faa8c9593b81f25cefaccd5233bbb2fbca2f4f6d558fea959160243a410950af
font_01_sfnt_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 10432 bytes
SHA-256: 979df498184e2d0ecede8d7c18fff79a715f77864692199de629bba602b97954