Malicious PDF — malware analysis report

Static analysis result for SHA-256 09410f15b1c94682…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 17:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6db9c0a7bb401237a67930aeab8ed800 SHA-1: d66d8b182f4cccbccf31b2b5fb7aa925f70024cb SHA-256: 09410f15b1c9468207d90b9a9985ff34725770b20c20a76b12c575ad2605f558
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various potentially malicious domains. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jilasenum.pdf In PDF document text
    • http://bk-plus.at/userfiles/files/64035567259.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/46387219395.pdfIn PDF document text
    • http://northcity.rs/slike/files/vamukevofamedoj.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/37246951544.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/4756058782.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/9812000333.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/40154728513.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210913032340.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/43796610830.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/bupidarewugon.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/lubirurajidapaxa.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/xisesozipurimigobase.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/povatipalobofodivovefad.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/30573116205.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/kebolisejomu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/bobakejorezigalibaxan.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/81786587342.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/panipexojapujam.pdfIn PDF document text
    • http://origo.ws/userfiles/file/73378457889.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/70166734934.pdfIn PDF document text
    • http://praguetransfer.com/files/file/mesilojuf.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/89459433005.pdfIn PDF document text
    • https://petala.gr/userfiles/file/lozaxudapowurumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=formation+of+three+germ+layersPDF 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_off0000af8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8A 16140 bytes
SHA-256: bfa8495d099dfde7bc545df801925cb648918b8feff19985eaa3c04741d29fdc
font_01_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 10752 bytes
SHA-256: 40049970f4355509990d2475df88b1ea4812fdf58430676930ad0fd39c9f31b2
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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