Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc52001c5a5f2a56…

MALICIOUS

PDF

77.7 KB Created: 2021-02-21 21:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9932cea9b0732e081da810fa268634f9 SHA-1: 597aa579c08ba9311247e3cfab6ed46048da3fb8 SHA-256: cc52001c5a5f2a563b130e439aded3e5e1cc680aebcabd5e2200e4ef1c0484f6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites, likely for further exploitation.

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://baarspo.ru/wb?keyword=how%20to%20replace%20needle%20threader%20on%20singer%20sewing%20machine PDF link annotation
    • http://1xbet-registr.site/cinema_apk_firestick_update_2018vzd62.pdfIn PDF document text
    • http://intereriia.com/12628030431buuzt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_6017c18b491d4.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/heHii7u/danapunomikiwaxawam.pdfIn PDF document text
    • https://cdn.sqhk.co/supibufuk/hijhgja/76756234895.pdfIn PDF document text
    • http://naturebiolog.space/bamadomapolelovugulasone1oxs9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601b549a48397.pdfIn PDF document text
    • http://swiss-gear-top.xyz/ice_hockey_stick_buying_guides9jfk.pdfIn PDF document text
    • http://kungfumalibu.com/kikitiwugezeso1hwgs.pdfIn PDF document text
    • http://pixxel.life/the_sims_4_cc_folderqgxs7.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/base_de_registre_windows_10675mu.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/kovufuxisumozawu.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/7hcifi8/superhero_mods_minecraft_1._12_2_curseforge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_5fd66e87bfa21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepezuvizomu.rf.gd/panofexowu.pdfIn PDF document text
    • http://novosumagib.epizy.com/jlpt_n3_kanji_practice_sheets.pdfIn PDF document text
    • http://gawoloresi.rf.gd/75996282353.pdfIn PDF document text
    • http://tibibexubedumu.rf.gd/90129720021.pdfIn PDF document text
    • http://porokeziz.rf.gd/lulakesuz.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_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 5540 bytes
SHA-256: d6a262fd2f5323576eff6c5175d097f2b485b9a7e9facd7ec14029d2718451bd
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10440 bytes
SHA-256: 0f6fe7ce9471beae6c0d16addd4b739baa91287220ca7e2f7179e43e52aa6512

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