Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3561c462f0cbf03…

MALICIOUS

PDF

72.1 KB Created: 2021-05-06 02:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c89855e1636fa87e63f9c87b4f53b24c SHA-1: 8e22755d86eae3768a6dec920fffa839ea86716a SHA-256: b3561c462f0cbf037a2059b0f211ca4227f8244e29909614041650b7d9b3424c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an external URI pointing to a URL that appears to be a phishing lure, disguised as a search result for a book. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically.

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://resalured.ru/strik?utm_term=understanding+architecture+robert+mccarter+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/jejefudebuxi/GIIKthe/32030215352.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/gfifOLG/untiedt_s_garden_market_maple_grove.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/iajiggh/shop_disney_store_key.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/fiibhj1/25108181791.pdfIn PDF document text
    • http://sewonmedix.ru/94887694807l2sjd.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/njapjbz/criticize_word_forms.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/YOuvHja/android_tv_sony_update.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/fhggcif/jizomezowabitibolugijor.pdfIn PDF document text
    • https://cdn.sqhk.co/fekimevexi/bejbjdb/laxenuwegalimosidafo.pdfIn PDF document text
    • https://cdn.sqhk.co/juroniwubiji/he3WYha/democracy_worksheet_for_6th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/j3jKEwj/microsoft_rewards_bing_search_bot.pdfIn PDF document text
    • https://cdn.sqhk.co/bukevexej/iYjisii/mezokigebalexi.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jfDwfid/all_saints_academy_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/jaiicih/21970931135.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/nefunupu/77701657361.pdfIn PDF document text
    • http://penugifo.rf.gd/one_way_anova_using_spss.pdfIn PDF document text
    • http://vunowowino.epizy.com/el_dorado_board_game_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/xefasonuzimowatub.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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 5792 bytes
SHA-256: ed8dcd8077b1532b021f4158569ff7bc66c448791e110a3f0572955d2c762227
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 10360 bytes
SHA-256: 7af13b6948e332be83c52ace49f28ad2f747567cea18bd63a2726ffc862c2213

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