Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ceca6678bdeca81…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 22:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c591c7750138f92dab6646b3161a4180 SHA-1: 558aea3c21ee48307fd05535edfb977bb2710218 SHA-256: 6ceca6678bdeca8137e7a5909e6a00bf4e934d6f1fa0d2b6f988bbce1671f06d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains heuristics indicating it's a malicious redirector link and a social engineering lure to install a browser extension or viewer. The embedded URL `https://dafemum.ru/award?keyword=chrome+plugins+adobe+pdf+viewer` is flagged as malicious. While no scripts were explicitly extracted, the nature of the lure and the malicious URL suggest an attempt to download and execute a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dafemum.ru/award?keyword=chrome+plugins+adobe+pdf+viewer In PDF document text
    • https://cdn.sqhk.co/dorodidur/ghTjj5c/adidas_outlet_orlando_online.pdfIn PDF document text
    • http://vekenuv.iblogger.org/drawing_on_the_right_side_of_the_brain_courses_uk.pdfIn PDF document text
    • http://dusixose.22web.org/when_does_guardant_health_report_earnings.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/fidakasari/hCIDaUT/36556515015.pdfIn PDF document text
    • http://podeves.xyz/88557729568s4ii1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/49435294416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36daab3-dd2f-44ea-bfcc-6c0f4d0a5b0d/57757912498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae21861-9d0e-4a64-b268-3ad2a2c27be8/gisasuwenusivugape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75fb2fbb-f72f-4aec-90da-5d70a7dae869/74894696556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28bf654-2cf1-44e4-8863-1bedee2596a3/83793681679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b477b706-0879-439a-b33b-d707f7a0251a/how_do_you_reset_a_kenmore_elite_double_oven.pdfIn PDF document text
    • http://rixuzomobe.epizy.com/facebook_workplace_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c7556b-9319-4ee9-a60c-badee1011653/65673721907.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/gapirafovikewafovexit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d41f927-7691-4e05-b92e-7efaaed13868/jozizojizuwajapavafuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/54856712262.pdfIn PDF document text
    • http://tezezilomaxa.epizy.com/66031671663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6effcf0-b3f9-416d-9b48-ff84be99e312/dafobemaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5bb9d4-632c-432f-9292-3a25306b3ddc/nican_mopohua_text.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_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 5652 bytes
SHA-256: 188250fcfd5bf6c463a5bf52d046a5e701c9c9171e4c7e9ea192939c14efce02
font_01_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 18940 bytes
SHA-256: e455278db853ba2a639da3b101afdbbf02d373851487a372725029b485d45d0f