Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8582edf3cee5165…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 18:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 563cd86fee912e9cadf7520af867c986 SHA-1: d3602883bede446653e2c3450d8684b7579ba393 SHA-256: f8582edf3cee51654dd699a62193873ba4cf67f631d1ad59fcaf3a5b37578881
126 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites under the guise of providing book-related content. The heuristic PDF_SEO_LINK_FARM indicates a significant number of outbound links, likely for SEO manipulation or to distribute traffic to potentially malicious sites. No scripts were extracted, but the presence of external URIs and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://kuzutuzo.ru/award?keyword=because+of+winn+dixie+full+book+online+pdf PDF link annotation
    • https://kamujepepafiga.weebly.com/uploads/1/3/0/7/130775209/menufizavufed.pdfIn PDF document text
    • http://fresh-ita.space/dream_interpretation_death_of_own_childketu7.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/5e46f5a9.pdfIn PDF document text
    • http://leaninrzpd.site/960302263267r733.pdfIn PDF document text
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/mononumi.pdfIn PDF document text
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/3291199.pdfIn PDF document text
    • http://studytogether.fun/17169042590ufhw9.pdfIn PDF document text
    • http://itash.space/space_engineers_pertamj83w7.pdfIn PDF document text
    • http://drenajkrasnodar.ru/356112130078clqr.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/70a22e4b-5e62-4cda-b6fd-6b8e3161d4aa/new_star_trek_novels_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977c7ecb-5c92-4cd5-8008-0fc45596601a/mogepoweg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e3d0f4-9955-4bd2-8b8a-1fff93712acb/21406825709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc5b4d7-ecd3-4833-b6f0-882b616b9885/what_diet_is_good_for_clear_skin.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/97770736367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1a782b-8f4d-4eed-acaa-9b6da5a06f31/stand_up_comedy_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29d642b-4e49-4a40-a781-df13b14c80dd/sozivizozudakidav.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/72717571931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b450da22-7857-40c6-bff0-6dc905215474/javascript_reference_variable_in_object.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99505ca5-7d15-433b-a656-d03d62526652/visarodud.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/vesasupomiseregu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b521d9-1898-4bd6-8fc5-3eb7c5b1fdf6/the_notebook_full_script.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/how_to_change_xiaomi_air_purifier_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c20ec69-2aa2-4d65-b11a-07188b397cae/61496558979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d489f130-e5cb-485a-92c5-0853a2147f85/44930734791.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/96731846401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55718a8-58a6-4c47-8a88-624a9cbec552/sugebebutiteje.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_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 5464 bytes
SHA-256: 851c282080c23c34370bb6a6e36954c3f032efbe7c8770d7268ab19f683a77c3
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 10776 bytes
SHA-256: 8920b87c9f32b4873e9d41d03b99adde1a312308eb4ca0e0f492c532a01cb623