Malicious PDF — malware analysis report

Static analysis result for SHA-256 81303795538cd07e…

MALICIOUS

PDF

84.3 KB Created: 2021-02-12 03:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 948dda67224a119b0592e829497b6058 SHA-1: cd1329c9ee15cc5b64bfeb2909977d891785e919 SHA-256: 81303795538cd07eda6d2ade21feed056dcad9da7000ea8923e1a73ae86b3837
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that promises free items, a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it's designed to redirect the user to a malicious website.

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://maypoin.ru/wix?keyword=free+pokemon+cards+by+mail PDF link annotation
    • http://copyright-central-media.com/toyota_sienna_owners_manual_2015ffldj.pdfIn PDF document text
    • http://bigmagazin.xyz/administrao_pblica_direta_indireta_e_fundacional0b077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5fecbb95f1313.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/jhjmgdr/94528121413.pdfIn PDF document text
    • http://greenbike.shop/hot_rolled_and_cold_rolled_steelsbks1.pdfIn PDF document text
    • http://nutristrike-shop.ru/rcd_310_radio_systemoo25s.pdfIn PDF document text
    • http://dorightschool.com/crossfire_series_book_29ne1y.pdfIn PDF document text
    • http://adyga.site/mopixip7x6ot.pdfIn PDF document text
    • http://remontvorot24.com/fundamentals_of_logic_design_5th_editioncg6va.pdfIn PDF document text
    • http://naturapple.space/alistair_dragon_age_dialogue_guidey63o3.pdfIn PDF document text
    • http://theandyhong.com/reverse_bias_and_forward_biasuib5t.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/buganabowumujef/lukesitevenerirotewufabo.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/format_factory_windows_10_64_bit_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/wuzenenozodewamukipitibu.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/android_backup_service_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/50488352408.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/69884119254.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/scala_rider_packtalk_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/devokabitipazipofiw.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_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 5188 bytes
SHA-256: b1081e42f1064f1b3da3aa2edcd06ae99c04bd252fd94693bc5948d8aeaa4485
font_01_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 11076 bytes
SHA-256: 0cd0917f6de222fd569ca8b585638939416783f74de97f0e770c030c02d02809
font_02_sfnt_off00013586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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