Malicious PDF — malware analysis report

Static analysis result for SHA-256 285d5fd1145c7931…

MALICIOUS

PDF

78.1 KB Created: 2021-06-01 04:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 384ad885bf6218fc8f455efbda352ceb SHA-1: a04e19447188e96f7b6e1fa1c2e4762049acbf66 SHA-256: 285d5fd1145c793112ae18b9a6a05082cbfeefcaefee9d93e7d099495dd218d6
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, with one prominent URL pointing to 'chcial.ru', suggesting a phishing or malicious content delivery attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured to host many links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://chcial.ru/pbw?utm_term=periodic+table+elements+named+after+countries PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368466/normal_600dc27094413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_601dd62feac42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490547/normal_6062f82197adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483337/normal_601ff44aa07c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_603c7cf26f415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_603cacb34dffd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469349/normal_5ffd6f875c2a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_605b34c9557dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_6068cb333df61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144424962/6778898009.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144422487/virus_and_bacteria_coloring_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9a8f65-4a9b-4ae9-b524-7183bf9a8a37/25357925238.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/energy_transformations_worksheet_answer_key.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/f/introduction_to_exercise_physiology.pdfIn PDF document text
    • http://veweran.pbworks.com/w/file/fetch/144433179/zuxexidewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20890c6f-e764-4fe4-8d4f-b9e605737fda/95115357923.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144423246/how_to_use_excel_for_daily_expenses.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/minecraft_free_download_unblocked_1.14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d686f85c-ee0b-49ec-9699-02dd367952dc/91308090542.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144422967/the_conjuring_2_full_movie_in_tamil_download_isaimini.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144431793/cards_against_humanity_online_card_packs_codes.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144412827/gekupoki.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_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 5308 bytes
SHA-256: f516e2d43a8140509ab3a955f45f54a29c9221fc81cb3257775ed020b1035e83
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 10668 bytes
SHA-256: 938fe084bea1d4f1a03a0689eaef8333f519caedbb3f7307218ecc18f7d5079d

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