Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ee356ba8fd69b1…

MALICIOUS

PDF

71.8 KB Created: 2021-03-22 23:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 187c628a029cdd183e9bb74874ed3ea9 SHA-1: b2347aaf747da9be52e6814014668ab17f7ea305 SHA-256: 56ee356ba8fd69b1ac6e7fefd0456094cf328d4c7a0599cbf222d85d9f0c70db
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. One of the extracted URLs, https://jumiwimov.ru/123?utm_term=high+temp+exhaust+gasket+sheet, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=high+temp+exhaust+gasket+sheet PDF link annotation
    • http://xamurewezoviw.iblogger.org/12166975781.pdfIn PDF document text
    • https://kulabukotijol.weebly.com/uploads/1/3/4/7/134703535/lupitelide-dazolo-befog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5ff6c6f747701.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/luwesavuvevisuvowozo.pdfIn PDF document text
    • https://cdn.sqhk.co/xosaletozobi/efLygeB/17825830819.pdfIn PDF document text
    • https://ronogutelujevur.weebly.com/uploads/1/3/5/9/135956648/gikejalorun.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/mevikofenawisa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5ffcad2f4146d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601cf98e3eebe.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/8244705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ninoxodibigadar.epizy.com/manual_de_auditoria_externa.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_e158ceedc234450d9220d8ac93ae6c79.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_e605a8c0208c4009937643c31486b011.pdf?index=trueIn PDF document text
    • http://josejutolaxof.rf.gd/juwowekawolesunaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/857b29bc-1813-4411-a875-bad101542d2f/functional_movement_screen_kit_uk.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_6d0cc71f840d4442885149fb7f8c3b6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6dd489-33fc-4444-ae40-21b20a80351a/84075231142.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_8c037116d4d34ee0a3c3134ab3760ab1.pdf?index=trueIn PDF document text
    • http://zapofekeba.rf.gd/serafuzukove.pdfIn PDF document text
    • http://novufojanaka.epizy.com/dudiwabozolubudigawuvopo.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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 5200 bytes
SHA-256: 90c09ecd736ef333fc43f6e69c94d1af454ce80c5b7112483f99e3b70bcc169a
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 11812 bytes
SHA-256: ab14c6b2b7aea27e5dd7e0827ab66574bd9e0d5c73122ef9bd5a5425ed160c70