Malicious PDF — malware analysis report

Static analysis result for SHA-256 218c328c7ba719f8…

MALICIOUS

PDF

96.2 KB Created: 2021-09-08 18:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5ed1df2f0c8a93de2185fb910e987a9 SHA-1: aa223dcf289a96c70fb3279d8202abc63574b82f SHA-256: 218c328c7ba719f855a59734103c9a4d7e2611fd3554b39b8d71e691c44d76dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.gpaci.org.br/cms/ckfinder/userfiles/files/49717904576.pdf In PDF document text
    • http://gorillatheory.com/admin/upload/file/50412697144.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/35059799192.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210906140103_YmVydXJldnVwaW1ldGE=.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210902125444.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/11733648345.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/dibiborubedoduvuxa.pdfIn PDF document text
    • http://agro-partner.com/Image/files/jiviwisovuwevawatapazo.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/galajolodumorodi.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/27850620951.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/61263255508.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/8675719384.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/lovukogifazubuvurero.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xenumowopizetozijajososa.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jijebupimuwival.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/jufaxusexebogapafijarujik.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613491504a206---34908720311.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/16660140011.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/82190922885.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/xofisirivifimariwotu.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/rufifefef.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/94806975905.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/5313618718.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/texokegetibigivi.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/zaxarakugojususi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=auditoria+de+comunicacion+interna+pdfPDF 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_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 19060 bytes
SHA-256: fca8133e329a61d5ba311a487776f78783d2b2d1b25eb303ff2d9e37d6493a19
font_01_sfnt_off00014242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 10648 bytes
SHA-256: eb1b5f7f876cf68057f8f7c3d0eac5dd0833209008023c0b1545444d4816d59d
font_02_sfnt_off00015a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1