Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa73f3ca06994160…

MALICIOUS

PDF

75.4 KB Created: 2021-02-13 11:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 397fd621818324f5e9300fa475744908 SHA-1: 536756b51baeff2907750862dd8f9e68678543d7 SHA-256: aa73f3ca06994160b3354fe86d58c45da6994d4fdfdbf46f524097d9e6fb3e72
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=bipolar%20dsm%205%20pdf In PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/gHbKhg0/disneyland_resort_express_closing.pdfIn PDF document text
    • http://vodaxuf.iblogger.org/93041695291.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/bgd1GhM/66697633966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_600f41ff347f7.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/jBgg8ij/62424164596.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5ff9b3124c014.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/descargar_call_of_duty_mobile_apk_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_6020a78393c05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kobizesamow.rf.gd/adobe_fill_and_sign_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/aap_se_milkar_free.pdfIn PDF document text
    • http://vonodese.epizy.com/beteb.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/free_zendesk_themes.pdfIn PDF document text
    • http://banumekopi.epizy.com/40484329809.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/37125430867.pdfIn PDF document text
    • http://ganesuk.epizy.com/72161191775.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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 5360 bytes
SHA-256: 4e76f222e4c7b6a03c875842171f7aed54b03e8ef7d6bd2202490540206828c8
font_01_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 10044 bytes
SHA-256: 9411e4775b7f966af97ee13030f4be7c75a2bcf866d29a7ecbec81c63bbfe04a