Malicious PDF — malware analysis report

Static analysis result for SHA-256 602a1f64a45f867a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 05:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbefbc7c9aec5d0c5a0621096b17b57e SHA-1: 201fd915afab76cec850a79b1e21a3a4f5f75d35 SHA-256: 602a1f64a45f867a0f273522bd09866d44a6b77ac0e5a5cfcf0ac17bfc536b1a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files, suggesting a distribution mechanism for malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a link farm heuristic points towards an attempt to redirect users to potentially harmful documents. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa548f1e44---vunotefizaku.pdf In PDF document text
    • http://jhdljz.com/userfiles/file/1631387203.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/jumati.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/lemuwenurejezopu.pdfIn PDF document text
    • http://video-cycling.de/files/file/warokojubebatogajuxu.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/45140945927.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/lewuwogovipuzekoma.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/85612274115.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/89470352879.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/vagakoterosozes.pdfIn PDF document text
    • http://air-ned.com/uploads/files/7284214434.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fofuwapuzusazoretegu.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zemenizemi.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/desisanesu.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/20718768418.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/96299707048.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2f439a2afb9ad371323dcabeba7ae2b0/jimanox.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/23801215533.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/38385628272.pdfIn PDF document text
    • https://keongracun.org/contents/files/nifuloxenusujokixinotixip.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/62962376954.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/fiwuf.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/mojuxobebarixigu.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/mijitekijugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=patologia+sistemica+veterinaria+trigo+6ta+edicion+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_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 18364 bytes
SHA-256: a4718d5eaf84f63e6dd476dd60a46fe1a153925758a38208741cdbd8fc19c743
font_02_sfnt_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 11200 bytes
SHA-256: 8ead171733c5549279e0728aa79878159007b6e845c830349c250ee24457672e