Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f02a3fab186323…

MALICIOUS

PDF

75.8 KB Created: 2021-10-01 16:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cad63af630fa4ab4f5c8cc9d505afa19 SHA-1: 2f016a7ca043cfc1e4565cd5454c686bba93c80c SHA-256: 40f02a3fab1863238553b912fd3fbaf9ebdd4992d4f0ac04398259c33c2d2968
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, with a significant heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=otr+open+world+driving PDF link annotation
    • https://charterboatdeliverance.com/uploads/files/ratawowuwubarutededowux.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/10100072110.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/fapodisujizafe.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/37749974564.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/63248141723.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/kasobaremabuna.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040902277714.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xejexuxejofikesaze.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/191101333322.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161370f9737447---togedozijoxatizazanivapu.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/48843071041.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/38784656806.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/pirefukivekejov.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/feteguworunubi.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/9352155980.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a8it7pkjmiiqrvq6onurvg27at/10266289801.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/35290926975.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/75074099853.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/jawanomikudul.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/2036457720.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109020505029987.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/73631906201.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_off0000bf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF11 10412 bytes
SHA-256: 8f3512b9132d891badd3ab44039d4b6b0b5422d1a907d4b7e2f59712045f80a3
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 19508 bytes
SHA-256: 373a8d9c85b2070ca36aad242f9ae69357ca42dbdd106f3f00451249ab756b45