Malicious PDF — malware analysis report

Static analysis result for SHA-256 93af3cf6b62b7693…

MALICIOUS

PDF

103.8 KB Created: 2021-02-19 20:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f837709ecdaaff07572f29e50da65ac8 SHA-1: 8bea7a1b21b1b0dc6e997c5d6228811979dafbf5 SHA-256: 93af3cf6b62b7693c23d5a330824971425842b9ccc812cb61bc487d36a5366bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'call to action' and the wkhtmltopdf generator, suggesting a lure. The presence of multiple disposable domains and redirector URLs indicates an attempt to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://druttle.ru/strik?utm_term=what+is+a+call+to+action PDF link annotation
    • http://fakaripeti.xyz/eso_big_eared_ginger_kitten_guide01gzp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445880/normal_5fe5b7b0646c0.pdfIn PDF document text
    • http://znalomstvavip.site/3d_pool_ball_mod_apk_offline6myr6.pdfIn PDF document text
    • http://repair-telefonov.ru/57690485605a9zp8.pdfIn PDF document text
    • http://logekolumo.22web.org/76373143568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381347/normal_6005fe0bf0155.pdfIn PDF document text
    • http://garant-ritual.online/gademimadagujugedepakib0u5w.pdfIn PDF document text
    • https://xobisopi.weebly.com/uploads/1/3/1/3/131379629/6674620.pdfIn PDF document text
    • http://prosucre.pro/fikunajefawejoqb43w.pdfIn PDF document text
    • http://fertpin.online/45697721708rjom6.pdfIn PDF document text
    • http://xitnet.fun/tememamabewe4gk.pdfIn PDF document text
    • http://zesabekuziwuga.iblogger.org/administrative_procedures_mcqs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerakunutage.epizy.com/tumobor.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9C 4804 bytes
SHA-256: f5b2084892e26973df45c194286be115f12fd3a7abd6227c1be6709f1352b9c2
font_01_sfnt_off00016c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C01 11284 bytes
SHA-256: 0ec0a698429fbde6d04ecb786bb9c094052e64df19258c94b395ca1d2f1c6400

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