Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7c3684d0fab7dc…

MALICIOUS

PDF

76.8 KB Created: 2021-03-10 21:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d7e33b58b9e405eb28e94d7088daa2c8 SHA-1: 8a9639a2eca900cff4395101f0df1b0698887203 SHA-256: bf7c3684d0fab7dcb4a3fdc411624ff97cf612ccdf6ded5247217c68bf017416
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site offering a 'sin city screenplay pdf' which is likely a lure. The presence of multiple disposable hosting links and the overall structure suggest a link farm designed to redirect users to potentially malicious content.

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://soxebez.ru/wix?keyword=sin+city+screenplay+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6023ae9e3a4f3.pdfIn PDF document text
    • http://italiahot.space/47948663158bg2b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_602247c64883b.pdfIn PDF document text
    • http://limuzinof.ru/links_awakening_trendy_game_tipsctfpb.pdfIn PDF document text
    • http://ideal-it.fun/yuanta_securities_co_ltd_annual_reportgz3ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_60342b9b862d1.pdfIn PDF document text
    • http://businessmentality.com/ahmad_shah_abdali_letter_to_peshway97ao.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/gMIjhjg/steam_broadcast_viewer.pdfIn PDF document text
    • http://starconflict-game.ru/73992146908y5vm4.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/jajeib1/bibafozatosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446924/normal_5fd157cedebcd.pdfIn PDF document text
    • http://swiss-family.space/zowagivagux1vl5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_7eef2aae6993460dabcdccc1b5ee9ed9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/uc_browser_software_filehippo.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_71cec169609b4521a737ce8c5b380286.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_fb1c916c84434692a4c7de707b5f2916.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/small_business_management_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/31273058348.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 5032 bytes
SHA-256: 3036760efe1a512cd7a97f2f1700c973af3ad9c1b22269becc20adbbfe4de928
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10476 bytes
SHA-256: f772764ccf491739f26634242ef9d7fe53fff0ec9ffcedbcbe23b3e0c80d6f91
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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