Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42556ae33d1bd9b…

MALICIOUS

PDF

67.9 KB Created: 2021-02-14 17:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b732b2f02a07dfef53c928b3efcfccd5 SHA-1: 52c4ce24a243e7f7c05e1aca3e5480947df25326 SHA-256: d42556ae33d1bd9b996db3ef593874999ae14bb29a1d41367b15499d9aa9218d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into downloading further malware or visiting a phishing site. No scripts were extracted, but the presence of an external URI and the overall detection profile suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=brute+27+snowblower+parts+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fcf67953e2ac.pdfIn PDF document text
    • http://bokifov.iblogger.org/angry_bird_star_wars_apk_hack.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/honne_day_1_sheet_musicydyv7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fe5a1ae10126.pdfIn PDF document text
    • http://sumavefomomag.22web.org/zonojigise.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/5hjigKX/school_days_visual_novel_walkthrough.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5ff80eede4c5c.pdfIn PDF document text
    • http://mydenverneighborhoods.com/kindle_cloud_reader_not_ingt10su.pdfIn PDF document text
    • http://sesaxojatox.iblogger.org/2061473226.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/nazekisigiduz/vamelevap.pdfIn PDF document text
    • http://doregupubufuve.rf.gd/chopin_prelude_7_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/kujuralemexutex.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/solution_of_homogeneous_differential_equation.pdfIn PDF document text
    • http://vudazirukileri.epizy.com/c_template_instantiation_vs_specialization.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/dexajobitipawo.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/64090521311.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_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 5460 bytes
SHA-256: c66be8b2a6fa5e8ad57ab880495a43933e6d38767438e0443d0a47407efadba0
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10916 bytes
SHA-256: 0d39e4edc7a04cc5989c3cc096865e12bfa9b48a0066170e5e60332d1179a5f5

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