Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb6e99797595919…

MALICIOUS

PDF

71.3 KB Created: 2021-09-09 09:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc0ae978588592d049d0d46053c713a1 SHA-1: 0b1bcd76c1ddb8b7a8c7b3ae032aa0bb6fbd6f93 SHA-256: 0eb6e99797595919b33651cccdbf77d7fa301276526477d46665a5b5f77ab4ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to potentially malicious or disposable domains. The embedded URLs and the PDF structure suggest an attempt to redirect users to external sites for further exploitation.

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136318753363---lotejepovulolub.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7716c29e---81331604422.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/konanosuxelemakatoz.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/41282665124.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/68862606242.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/ditilavusife.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/pedosozarosizuwotokawulu.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/kidaxebimedalopukaxa.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/81769437972.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/lakeson.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/lixazevewili.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/sutibog.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/27547157823.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/lojukomuloravisapagizes.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/tukemud.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/wuvuzuxafefed.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/847610250.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/tuwodezumapi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/29032060086.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/gipetoxipezum.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/49506773543.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/sopurolidakonalulovos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tamil+movies+2018+full+moviePDF 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_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 17088 bytes
SHA-256: b30daba6eb02a3c40e8bce3485e7febc3e0c0d7e19434912e174516255e874d4
font_02_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10704 bytes
SHA-256: 2ac9b0a4be24e201e85d7c4c190101926f3d0e0d4345507f412383a98bebaa9f