Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78a12e18e3b3d3a…

MALICIOUS

PDF

76.0 KB Created: 2021-01-14 15:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b07341f0bca0ceee390a2289d767eaee SHA-1: 393dfc5285c30ebe72a49cc3d897b5e6c57fcef2 SHA-256: e78a12e18e3b3d3ad476668b77a41163aa0dbb13ff94b18cc005b686934c9676
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with one pointing to 'traffset.ru', suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to biblical questions for children, which is likely a lure to disguise the malicious intent of directing users to potentially harmful external sites.

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://traffset.ru/123?utm_term=preguntas+y+respuesta+biblicas+para+ni%25C3%25B1os PDF link annotation
    • https://cdn.sqhk.co/badaxiloru/Wfgjcig/85001988415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_5faab82c5ad2f.pdfIn PDF document text
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/bimefulaxowikuverime.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/kanobuk.pdfIn PDF document text
    • https://ragikigoludu.weebly.com/uploads/1/3/4/8/134849848/kurexazoja.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/hcdMgdf/zenejev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejeseja/30804039488.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/b_ed_online_form_2019_gujarat.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/kijanuno.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/vigiguzominuduzusad.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/dramatic_features_in_an_inspector_calls.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/to_kill_a_mockingbird_chapter_22-24.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/xabidan.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/barcode_font_for_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/practice_it_answers_exercise.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5556 bytes
SHA-256: b2ffd8fa4a719ed72f2f45bf0e6cf728ed2fd840ecfe579b38509a58bba6e0e3
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 11396 bytes
SHA-256: 9126d22f21df51b3cde874a93ce010e99e70374edd94cf4aaa0bf41abd4c28d8

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