Malicious PDF — malware analysis report

Static analysis result for SHA-256 c868b57fb464c6b0…

MALICIOUS

PDF

77.3 KB Created: 2021-05-16 09:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dda99af8c72cd73c02fe661734f64c76 SHA-1: 24dfa2022cad24a5f79d94c67d02fbc3ee132729 SHA-256: c868b57fb464c6b091ee0f652f8d9512a9a6ab36045e37da14509345acebfc77
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm on disposable hosting, directing users to external URLs. The embedded URLs and the document's structure suggest an attempt to redirect users to potentially malicious sites for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=computer+hardware+and+software+parts+pdf PDF link annotation
    • https://cdn.sqhk.co/gijimexuv/hpiegdL/xuvomesup.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/hivghjb/super_simple_songs_baby_shark_chords.pdfIn PDF document text
    • http://reduslimitaly.website/3835441226194zaj.pdfIn PDF document text
    • http://prazdnikprosto.ru/60546045312zse82.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/hhAIyAK/46069647247.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/Sgdgd9D/51181668634.pdfIn PDF document text
    • http://trenketo.buzz/ludaxubojeba9k7zi.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/ijM8enM/vejinefobosolikimi.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/how_to_fix_lg_washing_machine_not_draining.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/antidoto_barbituricos.pdfIn PDF document text
    • http://neyroskakalka.site/488586030162jk37.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/virginia_woolf_orlando_a_biographyvyqug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5143ba8-43cb-4cae-bd7a-cae17cf0b711/anna_julia_cooper_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3c45ff-9ba4-4b08-b10e-23b5f855af8f/78621322112.pdfIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_26c9a09cc2f449a0b49710eaa07da56f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0f0ac4-babe-4d9d-8eca-ecc05c168938/instrument_to_measure_temperature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f88e8d7-5a18-47f0-ba0a-d61596a58454/avatar_the_last_airbender_the_search_part_3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9113df5e-d30c-4018-a2cb-3b56426e28c1/how_to_draw_a_cute_cat_step_by_step_youtube.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_5c5427fed9c44be8b2fd9bee5c317657.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c308b047-4919-4c22-a394-f2b61361757f/48116096887.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 5248 bytes
SHA-256: a28f12edb34bc2c2bcb881357ee63f32973891e13b0dbb77cdbed3a0ec59e260
font_01_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 11272 bytes
SHA-256: c5ed8110c55cab5f2dc6ee048c41e355aa437627d26c52d1b97a872367b2076b

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