Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf52242b96616e4e…

MALICIOUS

PDF

76.0 KB Created: 2021-03-27 11:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4a526d41f04369e6788ecf5fd9a652a SHA-1: c8186d97847761a0ff9ee66f6b39e880f786bf7e SHA-256: bf52242b96616e4ed7ba67dfb08d18c18615e316ff34ab939afcede9cfdb74bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wb?keyword=what%20is%20the%20standard%20depth%20of%20a%20washer%20and%20dryer
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/jikafawa.pdf
    • https://dikubudekoguzo.weebly.com/uploads/1/3/1/8/131857294/4020792.pdf
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/fisorukebowenek.pdf
    • https://cdn.sqhk.co/duwokarewesu/YejhKif/mobizen_screen_recorder_mod_apk_download.pdf
    • https://cdn.sqhk.co/verexumifo/lhegjgd/cv_template_word_sample.pdf
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/af01a.pdf
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/ccd0871.pdf
    • https://cdn.sqhk.co/rozopebak/876vXie/33868796098.pdf
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/lemorapizepilixax.pdf
    • https://wufopuse.weebly.com/uploads/1/3/5/3/135300065/bizuwiwe.pdf
    • https://cdn.sqhk.co/zurefaxenov/h4gfheH/microbrand_watches_2020.pdf
    • https://lutovadefok.weebly.com/uploads/1/3/3/9/133997447/dusivuvana.pdf
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/jujizar.pdf
    • http://yyyyyyhhhhh.space/junejapatazumemeguvatesogfc2zo.pdf
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/854f9f2.pdf
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/131eb0606a9.pdf
    • http://faceskinagainbeauty.xyz/30783451881asbx9.pdf
    • http://gamedv.design/ludovico_einaudi_experience_partitiofjws8.pdf
    • http://hookup153.site/top_rated_deck_stain_consumer_reports6xkuc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buganabowumujef/54086108451.pdf
    • https://s3.amazonaws.com/solonebosop/ionic_pro_turbo_ta500_ionic_room_air_purifier.pdf
    • https://s3.amazonaws.com/litunux/adding_decimals_worksheet_with_grid.pdf
    • https://s3.amazonaws.com/fomaralunex/dubai_holding_group_annual_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8c.bin
5c834ef0b22b2d50874f577f5000faa825c3f95e29c2077f7a81803edf489b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 5304 bytes
font_01_sfnt_off0000fdaf.bin
407c91badb82ec0f01b61d23de99aa6bcd7f7ed1ae0d148fdef68b754884a181		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10556 bytes

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