Malicious PDF — malware analysis report

Static analysis result for SHA-256 2359b0677578dbb2…

MALICIOUS

PDF

81.0 KB Created: 2021-05-07 11:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fa6a032e78939644fc001bfb74181a55 SHA-1: 298dc4f28caf8aa55b73b5667afbaa4e222b58a7 SHA-256: 2359b0677578dbb22c85f100e60320a25ca9c96c63442dbbf223a2e9984976c1
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URL `https://xajibur.ru/strik?utm_term=how+to+reassess+your+chess+3rd+vs+4th+edition` is presented in a way that suggests a lure, likely to a phishing site or to download a secondary payload. Although no scripts were explicitly extracted, the PDF structure and URL usage are indicative of a malicious intent to redirect the user.

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
  • 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://xajibur.ru/strik?utm_term=how+to+reassess+your+chess+3rd+vs+4th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424025/normal_602ab471f39df.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/BQ7GhjC/knives_out_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481161/normal_5fe5e5a05a384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fe4021c6176a.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/heeibbF/wowevogi.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/gWgVFia/adventures_of_super_mario_bros_2_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_605eee68836fd.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/mechanical_engineering_drawing_book_free_download.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://onlinetiser.website/pocket_informant_5_tutorialjq0dh.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/U6IGuKQ/jagowemikoku.pdfIn PDF document text
    • http://changepass.online/18948637907vj5ip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_6057112dbebd4.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/binary_search_tree_example_step_by_step.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/hVKdrw7/pear_launcher_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/Yihifie/kapojadum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://relivoziz.atwebpages.com/78677524676.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/ragekajaxiwele.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/77246855810.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_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 5460 bytes
SHA-256: 9039946a287891a7256ee4d164847899d5ab8c1c062486688508f78ad05355df
font_01_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 11228 bytes
SHA-256: 7c009d226fac21310335e3549a9ca0e568f67d94e9ace7cd893ad93d37ca10d4

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