Malicious PDF — malware analysis report

Static analysis result for SHA-256 08236438c19ead76…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 10:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00f61995e5391565326edc3d90b6e9b8 SHA-1: 4412f38bdd84d5c73b4124f6357b0c6c735f00a4 SHA-256: 08236438c19ead76c0519f57a4d2fdc7b1c28c2c9b733d211a4d0418b3390830
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many of which appear to be link farms on disposable hosting, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely indicating it's designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=lte+switcher+apk PDF link annotation
    • http://hortherbpublisher.com/files/upfiles/file/zagakikexosi.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202192215712.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/9930762446.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/kigerug.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/22177264748.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/79128705351.pdfIn PDF document text
    • https://securitydm.com/slicice/file/38685726799.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/764158b08eca8ab786c3e500c3c5cb02/pijilimujafefeke.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/wiruwikorolijor.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/giteve.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/denivute.pdfIn PDF document text
    • https://adikkedua.com/contents/files/gidaxasataguralun.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60983296652.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/rufisijadinawaxirojumal.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/19056843698.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/tajitupinu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091823520251.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/rurowawotibota.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/78155132918.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/zilogubarex.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/sevupiwanap.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/jidikakumigidulozo.pdfIn PDF document text
    • http://www.domaine-vrignaud.com/ckfinder/userfiles/files/52695501093.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210909020528.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_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 10336 bytes
SHA-256: a1c6604ef05cd174db2c50370579790973b8326ce81789c81b462c5366237d42
font_02_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 17732 bytes
SHA-256: 92a5522d0ea84848f41b200d07581f7457c50812fa63ba443d46ba1876995407

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