Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded38a094c068090…

MALICIOUS

PDF

72.8 KB Created: 2021-04-10 05:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fad118a3e363e983d3f1340b8f5ade06 SHA-1: 8bea11692557ce22eb02aca70d0d6f5fa66c4b45 SHA-256: ded38a094c068090d69a690f15f1f99db10e000d41a6b2dc6835b3e639ff9d71
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. One of these links, 'https://vilenefex.ru/strik?utm_term=juan+ramon+jimenez+platero+y+yo+english', is directly embedded in the document's URI. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URIs suggests the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=juan+ramon+jimenez+platero+y+yo+english PDF link annotation
    • http://helper-badges.com/17629068048ja5ml.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/xuxitujikebider.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386837/normal_5ff524df9f0f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447093/normal_600513eb2f17e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5fc8346aac4cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392660/normal_5fff3f19e15c9.pdfIn PDF document text
    • http://paselon.getenjoyment.net/ullman_introduction_to_automata_theory_languages_and_computation.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/98571934809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_60200789b1b66.pdfIn PDF document text
    • http://ontrade.top/528062988509zdca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_5fd39c662e792.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/gasuvaliga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_603118229cf3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_f8df6a11a0964711bc02dd8e92ce0d0e.pdf?index=trueIn PDF document text
    • http://tujupifirafadus.myartsonline.com/jokipiwijawodiwebe.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/convert_kindle_to_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/992979494.pdfIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_bf5e6262618e4b0c9af16dbb884c089f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neviwove/gifasote.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 5448 bytes
SHA-256: 503628b019f1b2c7a00709c0eecb045e01e5159f0dbed4cf66d034e604770a27
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 10584 bytes
SHA-256: fb5ed3ad3c4b31d0cc81f858c081769fb33ad388e7e419eb869f1e00104d8fb3

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