Malicious PDF — malware analysis report

Static analysis result for SHA-256 26032f1f46660a18…

MALICIOUS

PDF

86.1 KB Created: 2021-02-27 16:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28f18f93144d6ac9a05846cceaaf9b1a SHA-1: f83a5e0ad1aad5458905637cc1fc28d302b1c4f6 SHA-256: 26032f1f46660a18a03b1ac707579b8f00ea7527f125a73ac02bf627f9e74572
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing lure. The document body, though heavily obfuscated, combined with heuristic firings like 'SE_BROWSER_INSTALL_LURE' and numerous external URLs, suggests a social engineering attempt to trick users into installing malicious software disguised as a PDF scanner app. The presence of embedded JavaScript, indicated by the 'T1059.007' technique, likely facilitates the execution of malicious code or redirection to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://leonvi.ru/wix?keyword=quick+pdf+scanner+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487419/normal_6039723c95b97.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/khu6jaQ/45904383940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481272/normal_6025a50983817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fc60811e95cf.pdfIn PDF document text
    • http://parkingtest.xyz/nopubisorejusigetemoluy5aj.pdfIn PDF document text
    • http://secureappeal.com/62010206121dbmvl.pdfIn PDF document text
    • http://citrus-fruit.space/activities_for_developing_critical_thinking_skillskbhh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5febb0f299cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/DPgghdx/kipexomonebenu.pdfIn PDF document text
    • http://copyright-security-ig.com/55572475133j7dg6.pdfIn PDF document text
    • http://shoop-fk.ru/current_hot_topics_in_social_psychologyl9bg2.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/aLHjfRA/fezosebosubumo.pdfIn PDF document text
    • http://vizit.store/49379982993ou1v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5ff9bc8f452d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 5244 bytes
SHA-256: 7dca4ac6876cc31eaf63c0d9d5e49b26f72b5f108a733fa9a32764b2b303422b
font_01_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 10264 bytes
SHA-256: da519ee66653dc604ea5e453c1b774cb0255be6c608ba0f65cfbd7b8143860be

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