Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a30009b1b44f019…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 14:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5de8c479f0793fbab16d238a9719a1e8 SHA-1: 62ed811986bbec83a48fd228aab7e0224ffc2c7b SHA-256: 9a30009b1b44f01925539164027853d4314610fa9839d638a6851d7dcc53414d
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. It contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://getracemirates.com/userfiles/files/82191781109.pdf In PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/potele.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/mexidini.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/luvudotar.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/77771725656.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/92311366027.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614df4265d9c3---gudoditoraw.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/pezusajokevotegizunob.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/21904743198.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84715882742.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/xusumonolomedavegekozok.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/25889042373.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/masugivimiseduzatekoxup.pdfIn PDF document text
    • https://digireg.org/upload/jeluzikobevimuxa.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/73956897936.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfde6ae191---225365257.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/nekigewiferomonefoxedapaj.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109021833039738.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/82850734727.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89bb3cfe5---4937064119.pdfIn PDF document text
    • https://olterus.org/contents/files/lafavufejevulutopibusagu.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/ganifitojorijiganowun.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/97218705126.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/joweb.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/sirowowanufaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+locate+imei+number+on+androidPDF 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_off0000b737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB737 16704 bytes
SHA-256: 3b79220b2338cbb2cb6077e61ec3b686a90255857321fc9169e85c892d1c03f9
font_01_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10680 bytes
SHA-256: 3e7980dcc57c64cc691a12603d81f883380e0ac86fa3cf568471169a2c4fa63e