Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31f1713f658b1b3…

MALICIOUS

PDF

86.2 KB Created: 2021-04-05 11:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fcd0607d79ecd225a6aadad1c9efd883 SHA-1: 13cc860434bb628dcc4a909cb0707b86b6332da7 SHA-256: a31f1713f658b1b3709a58b1940f3c746a48c689f060e6f63b6a69aee10fcbe8
96 Risk Score

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 that directs users to a suspicious domain, likely for a phishing or malware distribution attempt. Although no scripts were directly extracted, the nature of the PDF and the embedded URL suggest it's designed to trick users into clicking a link, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=libro+case+study+houses+pdf PDF link annotation
    • http://megantv.site/26903497260jv7u9.pdfIn PDF document text
    • http://jipososuwo.iblogger.org/7661751492.pdfIn PDF document text
    • http://sewonmedix.ru/7282623764fv834.pdfIn PDF document text
    • http://nagupenaxija.iblogger.org/rainbow_rowell_libros_espaol.pdfIn PDF document text
    • http://ellmax-site.xyz/wahl_beard_trimmer_targetki6k9.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/lubujarumosazajamutuc680.pdfIn PDF document text
    • http://tradestaroffice.com/academic_stress_survey_questionnairem19g1.pdfIn PDF document text
    • http://1pokypki.website/blues_rock_guitar_lickstz84v.pdfIn PDF document text
    • http://kabejorudedofom.22web.org/xizutadenupunoripena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusogusobu.epizy.com/dazufuvof.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/pals_park_clermont.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/37301175761.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/36733576810.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/96500661401.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/48087739629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc08f49a-f84e-4f60-a7ee-cd3a1dd7efdd/crochet_scarf_for_beginners_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d082bfa9-3c70-4263-8526-53bed042fbc5/91872793810.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/cinema_hd_apk_for_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415c3041-bd88-42de-b0a0-b85695c72c15/mixed_conditional_sentences_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9867e1-6455-4df3-93e9-e42f3c0be6a8/22650641702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbae9bfa-63f7-4053-be3d-9054aa282176/conversations_with_god_oprah.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/tuvaxovidoxejeno.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/best_gre_vocabulary_app_ios.pdfIn PDF document text
    • http://ravexigulot.rf.gd/82954673889.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_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 5396 bytes
SHA-256: a2205b2bbeb05899537f0d77b93da47fa515b93d16f60c7f2ee86c505093d33e
font_01_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 10984 bytes
SHA-256: 9282ded8c25bbb72624cbb71f274299ebf69fde55f54cde26ff5696e8fba8a38

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