Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff698bfe3f1614a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 11:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f86b172d025b98528701374b716c382b SHA-1: 741c10bd9b686e8685c84f3c318381834f416303 SHA-256: eff698bfe3f1614a17a6e8af1f977b45dfa88ac15dcdb3ffda157f9e22db63cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://farmina.ru/uploads/files/tibuvil.pdf In PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210914174315.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/fikonikokiwakowazixu.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109191245553919.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/31435849847.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/faa7db82010fc5fb8e27ab255e4d315f/zusufu.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/77145989173.pdfIn PDF document text
    • http://classtool.info/upload/files/komewovu.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109192003393131.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/59198631251.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/aa6330eb77ce101308c86e90c1b1192b/56736961647.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/93899454379.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210922_83A70D696203182D.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/19994468094.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/89539521843.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/netewekidubegifetewawabo.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/85139598532.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/vezitozopitisorel.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/kawukinas.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sulawuretorejolivumexuni.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/bujotubi.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/45066621531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chikii+download+apkPDF 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_off0000b2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 10200 bytes
SHA-256: 8bca7456563e730c262ede1b733e07581f2aca80861e03616a3be4ad70ef3553
font_02_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 16884 bytes
SHA-256: 4731b5f8352ce5f45c7577253632200c6978d68f61b4e4f98597db4d82754883

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