Malicious PDF — malware analysis report

Static analysis result for SHA-256 6999bda4cb9a1d74…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 02:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af2c7c82628a13e91695f103e0c79077 SHA-1: d9d262a97ea6b638464b26705bdc5769d591145a SHA-256: 6999bda4cb9a1d746a15ca3a9e6d2a571fe45bf5ee6c70399957ba1725076c12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kit-veron.my/ckfinder/userfiles/files/dividupetinuwidagitosud.pdf In PDF document text
    • https://etimes.mn/uploads/files/nurutorepipulugazodeme.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905033213743564.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/82037637647.pdfIn PDF document text
    • https://ambalatender.com/upload/files/wojujakefujiwap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fabc3ae9c---rorekilevawepobulomidi.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/90328191346.pdfIn PDF document text
    • http://cityfate.com/files/files/vuketipomupaj.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/roguvuma.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/sekefupejegosewezutoxifug.pdfIn PDF document text
    • http://change4best.ru/upload/file/jemonavuromojafezep.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/51882624603.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/96853910562.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/96015920256.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/26651367350.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/rosulifenimavebe.pdfIn PDF document text
    • http://exosushi.com/uploads/files/pikavu.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/56545117818.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/piwubigorusidamilabog.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/83411829099.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd89c4934---loregurenotunebiviburuvef.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/jaxaximud.pdfIn PDF document text
    • http://thongthien.vn/upload/files/17602644388.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/71989853739.pdfIn PDF document text
    • http://ailizia.com/userfiles/gesezanejigavepopuzi.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/xipirubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=patton+2002+qualitative+research+and+evaluation+methods+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/basekoloseparikabunog.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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 11440 bytes
SHA-256: cd98fa895b44b2aed3a629a640b85213a3279f5d4bd4d127de45c62e62a8e96e
font_02_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 17888 bytes
SHA-256: 9cd2035767c7642d2f1e6fc65eb44ecb37a25335ab4c5c9f4fb564abecbc8504