Malicious PDF — malware analysis report

Static analysis result for SHA-256 7835ba9c4bf8ace1…

MALICIOUS

PDF

76.9 KB Created: 2021-03-25 05:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0b6dfb99338e1979ecb3937da4d80102 SHA-1: 212681f22f3d2ff51a9abb0c1c5a24a9900d17ef SHA-256: 7835ba9c4bf8ace1900a9ff8ced388101cc9192c20c66177d368353e32c21c8b
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'https://baarspo.ru/123?utm_term=online+certificates+free', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains strings related to 'online certificates free' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=online+certificates+free PDF link annotation
    • https://cdn.sqhk.co/sabepakofo/hbehaPv/snake_is_io_snake_game_download.pdfIn PDF document text
    • http://sidagopuxi.22web.org/96415908202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fff4cc2c2f54.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/0fyAr8U/25279524265.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdfIn PDF document text
    • http://molosorew.iblogger.org/list_of_african_countries_and_their_capitals.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/gdjdpjc/extreme_racing_suv_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/rphaiid/open_houses_in_freehold_nj_this_weekend.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_6051a4fde2070.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/ExZjjie/pumol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fifomivosa.rf.gd/gedatojisofiwof.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/how_to_view_data_behind_chart_in_excel.pdfIn PDF document text
    • http://ziwefegilow.rf.gd/puwunip.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/23183582687.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/nyc_comptroller_report.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/on_the_road_2012_movie_download_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/wijelinegaperab.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/add_subtract_mixed_numbers_worksheet.pdfIn PDF document text
    • http://tadigolunus.rf.gd/12746683731.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/bsr_2014_sri_lanka.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/muxefitexugusu.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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 4904 bytes
SHA-256: b274d31ac594a160bc2c077d2fbf11424d3615d734a68471632524f58d20087f
font_01_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 11220 bytes
SHA-256: 46d7b170190247a916223efb3f5e2c1f8a2a9514e5391801d26e58fec0932cd5

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