Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd90a213a1c15f60…

MALICIOUS

PDF

74.4 KB Created: 2021-03-19 13:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ad4d84e625f57cb3abe94c53fd706b8 SHA-1: 7318729f663455ca47c7d59dc4787d0f796a3b62 SHA-256: dd90a213a1c15f60c4066b0f24d85b89669566452dfc515de875b7f4f249734c
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=chirkut+band+all+song PDF link annotation
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/8882836.pdfIn PDF document text
    • http://pijebum.iblogger.org/o_mio_babbino_caro_sheet_music.pdfIn PDF document text
    • http://kismyketio.com/gukewarogoxabazelexuvimoyny6t.pdfIn PDF document text
    • http://vumavotanumibuv.iblogger.org/fiendish_template_pathfinder.pdfIn PDF document text
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/tuvugitir.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/ninadi.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/3364656.pdfIn PDF document text
    • http://homebig.space/moto_z_play_front_camera_not_workingr8fj3.pdfIn PDF document text
    • https://pafovawulawagi.weebly.com/uploads/1/3/4/5/134581771/2c28069.pdfIn PDF document text
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/gejakopogo.pdfIn PDF document text
    • https://zafivagofe.weebly.com/uploads/1/3/6/0/136011523/wedukiwa_zisanovetem.pdfIn PDF document text
    • https://fopudodesesiwen.weebly.com/uploads/1/3/4/3/134344932/kakupi_wuzosu_bozepuxogubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_910680958ba14f9d873252d511b2e8d3.pdf?index=trueIn PDF document text
    • http://lunowakaneruf.rf.gd/deficiencia_de_vitamina_b1.pdfIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_0d74c286a83041b499b1b46aab9b4068.pdf?index=trueIn PDF document text
    • http://govomasoleva.rf.gd/interpretar_planos_arquitectonicos.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_8d0b189de21e4c7596f08849d1a28c98.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_a4a80a0ee2db41d491c96076fe98e828.pdf?index=trueIn PDF document text
    • http://dimonejoxu.rf.gd/a_day_in_the_life_beatles_piano.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_cdbd905f94b5488db254063bbdc917fb.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 5196 bytes
SHA-256: 9e8d86640be35cb98e09ced6cfbb36955547dd2d77e65688d426b2d3f42c741d
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 10600 bytes
SHA-256: 90f62bb2977293d79bdc8bb24739f8278f5b4def0dcd6577670e24c7e1f9a6a6

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