Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbafeb5ed48fd9b7…

MALICIOUS

PDF

80.0 KB Created: 2021-02-15 14:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 65caabdb69a0dc42e1d10862bc73cc62 SHA-1: bc5fab636017953ba36fd0528f1a8f2c3936fd05 SHA-256: bbafeb5ed48fd9b7f9074f18633b8a1144b3f475570b27a2bbe070828e0871b6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=penguin+hidden+message+worksheet+answers'. The document body, though heavily obfuscated, appears to be related to a worksheet, reinforcing the lure. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a phishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wix?keyword=penguin+hidden+message+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/gerukoso/ghhgkgh/glitch_photo_editor_vhs_glitch_effect_vaporwave_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/rgcQwja/xekelozodigisitanigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_6022706e5487e.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/i7ihNhs/sword_art_online_wallpaper_iphone_1080p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5fd777c6c009d.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/Q5WFjbR/bilibekotabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_5fd780c3ac830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_600a4490f2d8c.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/jhfF5jh/7680999990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_5fddf53e2322a.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/dzgehex/81009730130.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/hcjdgih/mario_kart_racing_game_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/fabrication_industry_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/15693772620.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/whatsapp_call_recorder_free.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/zelajosel.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/finding_the_inverse_of_exponential_functions_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 5248 bytes
SHA-256: b4f5340da729ad0a133fe2c155e89d6e323c5b99f4a2a7cc7db8e8735825e7bb
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10596 bytes
SHA-256: 06dd0cf064047e5ce473aebb53c82d6f8a071ecf2912810a2b9194b42f39043c
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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