Malicious PDF — malware analysis report

Static analysis result for SHA-256 899b1a8d5b7e6bcb…

MALICIOUS

PDF

70.3 KB Created: 2021-02-18 21:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6f34258b5ab1c0d8e82293cee9d85fd0 SHA-1: afddafaced5143e23e34391a30d6410f692e425f SHA-256: 899b1a8d5b7e6bcbadb61c87211397eb4aafeeab6ff002b446f93d599e6902d4
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 URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. Although no scripts were extracted, the presence of external URIs and the nature of the ClamAV detection suggest a phishing or credential harvesting 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://bologen.ru/strik?utm_term=online+survival+games+multiplayer+pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387808/normal_5ff7f1eb892ba.pdfIn PDF document text
    • http://verifybadgehelp.com/tosibofipowejinavadokinakj6jv0.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/wgeEjdi/giwela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5fffeb79001dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_60298b8bb91d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6016c9874d1a4.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/folexapurilowe/tecnologia_da_informao_salario_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/sap_s4_hana_basis_administration.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/how_to_prepare_7.4_phosphate_buffer.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/antrenmanlarla_matematik_1_zm.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/45744399229.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/aradhana_movie_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/kuturotow.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/reply_1994_ep_9_magic_eye_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/yes_boss_video_song_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/87255530972.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_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 5444 bytes
SHA-256: 98de37d25478b3b40bf7f6a5ba52fad9d539ed0a62f22d2538c69605baf9ff47
font_01_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 10624 bytes
SHA-256: 7dc1204c862f27124130f6a4db0b298ffd750ea8398e616e95e8c5804a7c64be

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