Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ecef885c3a6328…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 05:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 300deaa1b256459d0be7f5df163abf7d SHA-1: 14d203349fb0530025cf4998aec8dfecf42a375e SHA-256: f3ecef885c3a6328aca9a30a459205f0c920a7b1ec426507539fb217037375cb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The primary lure appears to be a link to a collection of PDF files, potentially for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://xn--or3bo5mvlb.com/data/editor/file/bonodexinukugovibonomuk.pdf In PDF document text
    • http://vzwsportenmuziek.com/content_docs/8391568891.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/70734874482.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/68667358310.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/nalujiv.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/ganukojagoru.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/punuxarisoka.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/72018043203.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/wurajavi.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/xudowadexodumad.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/27382325162.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/29808802170.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/11900429088.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/kuzoxitivusutugaw.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fe26312010ed5b1d74ad3307b1091064/gixirori.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/58841848245.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f57be5fa---zajebapoxomejibobi.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/vodakewivuxawovo.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lozamut.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gawotaluda.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/bajiwaba.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kibevolabetuwosamemi.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/nurutijojanidofoburima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sherlock+holmes+ki+lokpriya+kahaniyan+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC005 20688 bytes
SHA-256: 18e93079d1143f0190e3dabe7657232275f793f0aef37af17b5c2a1810bb8993
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_03_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 11068 bytes
SHA-256: 6278419ef4568bf298973130bcc35ed3f8369b8e77ccb5b945cc021c6dab8e4e

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