Malicious PDF — malware analysis report

Static analysis result for SHA-256 39961c6dcdccb8b1…

MALICIOUS

PDF

74.5 KB Created: 2021-03-16 08:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 15bfd2956d70e11f561f67b9aa2ce6e7 SHA-1: 261e600d80cbe7118eb6b9e25b8a8eae8766c85d SHA-256: 39961c6dcdccb8b1c1e54e6f097d34079dce95f97768bd57b3ec4a177836ff42
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://dafemum.ru/award?keyword=dynamic+stretching+book+pdf'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=dynamic+stretching+book+pdf In PDF document text
    • https://cdn.sqhk.co/gopuxipo/ejc0BoA/acrylic_nails_shapes_short.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_602acb2b0b22e.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/giajfgf/gogumawamogepomuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_602dfcd45eb6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fdee8ec78b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_601f435d4416d.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/ifKF4hi/66802186853.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/SzhgWZZ/happy_birthday_cake_gif_images_download.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/Qjb9ic9/fallout_shelter_online_english_release_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepilige.epizy.com/35696081059.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/ba_english_poems_book.pdfIn PDF document text
    • http://nolagevupuxuje.epizy.com/internal_control_system_in_auditing_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/28567728114.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/67249138497.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/how_to_use_instant_pot_duo_pressure_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/vumibutof.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/wwe_highly_compressed_android_games_apk_data.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/wixanavurumakel.pdfIn PDF document text
    • http://xigoxusokumebu.rf.gd/bsc_botany_honours_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/35870932724.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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 5840 bytes
SHA-256: 5ce6be47e8ec34090066db7899d2bfa831ab04baf4dced9d8d2e5e4e81118c40
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 11620 bytes
SHA-256: cba7c1d0b507169ac9eaac8bcaf82040318fb9b2e7196feda8fde4ac54104c8c

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