Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a18088aebd4938…

MALICIOUS

PDF

72.0 KB Created: 2021-02-09 19:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 32c0658840be0956df5a62bbd4954d84 SHA-1: 4e0663bd674fd4b0a3d6ff1ef53854d1f1af8c75 SHA-256: 79a18088aebd4938714404409179a3951bb02bdd35dfdc8ba7de61d9531e7f4e
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, one of which, 'https://jacksth.ru/aws?utm_term=android+auto+aggiornamento+4.+4', is directly associated with the lure of an 'Android Auto' update. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest the document is designed to trick users into downloading further malicious content, likely through a spearphishing attachment vector.

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/aws?utm_term=android+auto+aggiornamento+4.+4 PDF link annotation
    • https://cdn.sqhk.co/fipexuwebo/ibhgevv/vorurujedosevozanoki.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/hVTE1jh/repost_story_for_instagram_android.pdfIn PDF document text
    • http://esmoney.site/magic_magic_video_editor_pro_apk_modfnlwr.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/igAgh1p/sandwich_king_chicago_restaurants.pdfIn PDF document text
    • http://fujubipe.22web.org/app_backup_whatsapp_android_para_iphone.pdfIn PDF document text
    • http://mumokajepuxu.iblogger.org/crystal_reports_for_visual_studio_2008_tutorial.pdfIn PDF document text
    • http://tipatav.22web.org/29718538835.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/matogapibelifiv/68764855902.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/bhojpuri_video_gana_hd_mp4_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/clear_acrylic_sheet_uses.pdfIn PDF document text
    • http://fepujevuzal.rf.gd/adenocarcinoma_de_colon_moderadamente_diferenciado.pdfIn PDF document text
    • http://xixupokolaxusuv.epizy.com/cadastral_surveying_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/nusipexagofepowovewoga.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/vajijusagovugezege.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/bahubali_2_film_hd_video_song.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_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 5044 bytes
SHA-256: ca9769a7b3bcd41976e9e8b9b9e3a80bb62a36adddc6c731fead969755c8b7d7
font_01_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 11996 bytes
SHA-256: 27028f7b2c9feb159c5270893c7aa357f2cbb6ec6bb0f58df000f594d5e3bcb5

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