Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9265ac4e778ab6…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 10:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80913898110df37665fddc5bb935f6a3 SHA-1: 5756f99557a56501b7c306b0d181bd5b9ef12f82 SHA-256: 2a9265ac4e778ab6e788eb040b5c330e025307f71b0c3b7433798dcc758dbd88
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=heroes+of+olympus+the+house+of+hades+read+online PDF link annotation
    • http://houstontca.org/Content/uploads/files/kogogarivobuwanalulonepo.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/58656195263.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/bidibegolejevesibagu.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/fenijifegu.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/8819741192.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/tinimi.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/kunatuwidugo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393221429c4---40323210770.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82935577016.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/92390450231.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/78697692093.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/53845673577.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/nafekamomulawenadoporut.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/14715727109.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/11311413868.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/rojowowat.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/borupesebafolapom.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/bomaka.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/senex.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/63490172220.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3e3670939b794d72cc23eea454adb9a5/41589517509.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/21514157745.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109090636152287.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/bitavilanakutiweme.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/58280945654.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_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 18500 bytes
SHA-256: 53d0fa5cb1c3306815286e06ae4460eafa6698d58445a048ace71c095414f8c8
font_01_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 10968 bytes
SHA-256: 4f8e4fc9f382e4d00b48c5cc8d05fe6f11a3615e0f89ddb1d8d9047f65f9af9d
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1