Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8215698265bbce0…

MALICIOUS

PDF

84.1 KB Created: 2021-06-09 23:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b1127973e1fd88e17cebbefb7f8c79b1 SHA-1: 5553f76c7f6ea5a60c4ddce2d197980ce2194695 SHA-256: d8215698265bbce0c6fd203ac7ce6af7675f4a8b9242cb412906512e0f838beb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or to distribute malicious content. One of the primary external links is to 'crysiq.ru', which is likely a phishing or malware distribution domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://crysiq.ru/pbw?utm_term=autobiography+of+jose+rizal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490936/normal_602ef4fcc66fa.pdfIn PDF document text
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/senupepikasu_mexoxukum_dajibuwu_xafobalubumo.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/0ab0969a18fb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5fe307f78c63b.pdfIn PDF document text
    • https://galatowev.weebly.com/uploads/1/3/4/3/134325578/lazufiper-mivevonokotelow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_604b7f0a8d30c.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/902f721aa02d4.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/mumogefosunuge.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/45c6b280-aaf2-4df3-9e91-e4293662129b/what_is_inductive_and_deductive_reasoning_in_philosophy.pdfIn PDF document text
    • http://sejiliki.pbworks.com/w/file/fetch/144575277/can_you_log_into_venmo_with_paypal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd0c5504-9830-44a4-ab05-b8cab97b620c/56129143828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab8db7a-4029-4315-b1f3-cf5513172f7b/how_many_ft3_in_m3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f259bc4b-b8e6-4014-8ab7-1211524436a8/dragon_age_origins_blood_mage_nightmare_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5ade89-79c1-49d6-a797-895c0bfe8492/javinetikowotiloxonab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24bfe5c-ba4f-435d-ac57-cc686ca70b82/fawubebobogefeveb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c1d063-2754-45de-87a0-0a20d5da3a61/39292606984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f4ac23-b4c9-481f-a9db-d56d68c1258e/marks_standard_handbook_for_mechanical_engineers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1445d001-0ddd-4f6e-9671-f83a214b4167/tudapifugivepobitamule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e7552a-2740-4bb8-bb95-1de2b6eadf9a/the_end_of_the_affair_1999_film_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2acd78a0-d911-4f0a-bc14-6da1b51d59cd/comprar_libros_juego_de_tronos_espaol.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144514266/42843379001.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_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 5660 bytes
SHA-256: 206d5f3632b58450178e80e3a9716b7ffb4aa4db0362c3498cf89ae857fc2482
font_01_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 11064 bytes
SHA-256: 67b287b350a41fd0e6fdfb54b6a26052485877bc1e762a702d1d4593ec426e46