Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab656b86b12f9eb…

MALICIOUS

PDF

64.8 KB Created: 2021-06-04 10:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc0969be29a9b1b2a07c93f43de93f65 SHA-1: 11629dbd66b8372bb44ba29d559c29216a131803 SHA-256: cab656b86b12f9eb14d4ac83ccd02c92918812768db5e81abacce73fd877fcaf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/pbw?utm_term=prentice+hall+geometry+chapter+12+pdf+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450878/normal_6000fe7185fe0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464301/normal_5ffa7ee598dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_605f678d20468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368759/normal_5feb7960f0d86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokuwatosat.pbworks.com/f/temperate_forests_abiotic_factors.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/46201983280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e16496-b167-45a5-bd7f-56b7ce21ee11/yes_we_vibe_shoes_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f756fe43-881b-4575-a4d6-c4237de06288/what_are_the_different_types_of_cardiac_arrhythmias.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/husqvarna_mower_blades_wont_engage.pdfIn PDF document text
    • http://pijipusap.pbworks.com/w/file/fetch/144577698/92535144501.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144454959/29683102094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3c733b-00e4-4303-ab8d-4a01b417e345/18971816627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e3cc49-99f2-4cc8-8a7e-fb0320bef35a/208033250.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/w/file/fetch/144604068/10377481954.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/how_to_noclip_in_geometry_dash_pc.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/biochemistry_final_exam_questions.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/what_are_the_research_topics_in_human_resource_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e2af9d-b49b-4cb7-8b87-3b1216cbc85a/how_many_diary_of_a_wimpy_kid_books_are_there_list.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_off0000c0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BB 5948 bytes
SHA-256: 2fbfd16c4e0388d857891f3afdc941b32ca59a1af3d35b8873926485f808e390
font_01_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 9768 bytes
SHA-256: 5d7d8c5dba9d1e3d618f18ea0133955b4e897440a606363e2f7d9b366fc665ef

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