Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2f4d7146b93fdc…

MALICIOUS

PDF

78.7 KB Created: 2021-04-27 16:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7d2ca982de661653ac44aae3448af177 SHA-1: 24a5602b7e5e0c6d6c094582e9b510c1c96b0cc9 SHA-256: bf2f4d7146b93fdc391f9a94d076ef07eae615f13b585335f8ee2418e53ab91b
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a phishing or scam attempt to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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 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.
  • 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://resalured.ru/strik?utm_term=star+wars+book+series+ranked PDF link annotation
    • http://kusufuxufatup.getenjoyment.net/problem_solving_and_decision_making_book.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/gjgiiab/hello_neighbor_act_1_walkthrough_2019.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/sofemowosepesuguz.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/jitofekalalatuse.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/vitefakozofoxefuvogaripu.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/hiKhbha/free_book_site_quora.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/reliability_and_validity_of_research.pdfIn PDF document text
    • https://cdn.sqhk.co/botajedelej/mhe5gjg/kawuxewazugevizobozed.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoweva/7jhSThh/call_of_duty_black_ops_pc.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/72420014610.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.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/xukonakefules/noxugabixateva.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/35167589562.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/what_is_benzene_used_for_in_pharmaceuticals.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/art_basel_global_art_market_report.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_ac6d8e988ea34ec19636815a00fee24f.pdf?index=trueIn PDF document text
    • http://xologikaju.atwebpages.com/81902002463.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_50420c239dc54564b88d427fca338ec5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/71198212025.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_40e7953a37f744a18273eb66dd3217ad.pdf?index=trueIn 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_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 5184 bytes
SHA-256: 719465ae25728c0749ba01f7cc9e33dc6aec52bc726f0bb5f4fbacea97a4ff6a
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 10932 bytes
SHA-256: bac851c34f7cf78576058f085dc725ab8b1da59e6e32a5e798af753d8051ec49

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