Malicious PDF — malware analysis report

Static analysis result for SHA-256 820c612f2ba91937…

MALICIOUS

PDF

72.0 KB Created: 2021-01-25 17:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ec3a432551798d82bbcf5b8be171480c SHA-1: c62171573c9bc9cadd8a87195717e06e2f5f8fb8 SHA-256: 820c612f2ba91937cc100c7fb968e2a89bde9a2cfb8455838f800f29ecd9404a
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://crophysi.ru/123?utm_term=timberleaf+soil+testing+company'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to lure the user to a compromised site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=timberleaf+soil+testing+company In PDF document text
    • https://cdn.sqhk.co/gepeduvo/ZR7ICtP/zombie_raiders_survival.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/byjjTje/severe_traffic_jam_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/JhbKjao/drowning_crossing_rio_grande.pdfIn PDF document text
    • http://forpost-electrica.ru/go_karts_for_sale_craigslistvgvs3.pdfIn PDF document text
    • http://mazafaka69pussy.online/fundido_meaning_spanishvbb2y.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/etshhha/fun_90s_music_trivia_questions_and_answers.pdfIn PDF document text
    • http://rineset.xyz/farevodixugeeooyv.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/nakevoja/google_chrome_and_install_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/nike_women_s_tights_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/16076139162.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/endogenous_endophthalmitis_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/cnn10_student_news_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/warfarin_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/50802855560.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/36368085847.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 5524 bytes
SHA-256: a5c2a6c91aa33a02746fadd0ad6ecf10bf9f0513f6802c9c11553ee91c550986
font_01_sfnt_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 11020 bytes
SHA-256: 58b6891f8b3b4261082861e780c0fff7c91dd97125fce75877eec9fe75bfb102

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