Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c537b2d41c608e…

MALICIOUS

PDF

70.4 KB Created: 2021-03-10 04:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a8f02e2727b8e4eba19bd60ba568d736 SHA-1: 8f80686ffe5bf76412cc7bb68c291a692cb4c465 SHA-256: 64c537b2d41c608e49fcfcb1e5720ac58ded9d09529cccba8131cf6aeee01516
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://lozipotod.ru/123?utm_term=mixed+tenses+exercise+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/letopoto/05PCicT/11299323892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_6025410988b96.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/ojajfjc/classic_arcade_games_for_android_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_603caf51aa844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5fe8263ce96e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fe31cf0ccaac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464313/normal_5fdfded640b3f.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/7vpy1ii/halloween_word_search_coloring_pages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_6024115ded1e4.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/hh3Aic9/89867080018.pdfIn PDF document text
    • http://zapixexarepol.medianewsonline.com/brainstorming_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/jevhggf/koxivaruginodore.pdfIn PDF document text
    • https://cdn.sqhk.co/vomofizog/ggFbigz/meropanateji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_5fd1545d16dc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5ff4cb7bbb32e.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/iVhbjf1/4718193292.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/dJtugf5/forest_wallpaper_for_iphone_x_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/d4ji79j/frantic_stamper_blog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_d3cfd6359c354520a53897c7c1e3c985.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_c16a8a85f033421890aae7d70c60d50e.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_7fa5c3da2e4042949dd522571bb71dd6.pdf?index=trueIn PDF document text
    • http://lafagelupuf.myartsonline.com/49520267536.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/what_year_is_chemistry_in_high_school.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_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 5376 bytes
SHA-256: 488956492a38a71cceb45ea76a122a33fd91a011120259b01f875aa7e499009b
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 10868 bytes
SHA-256: 1d2491b64cb47b2e9ae6cc16fa5f629d9fbe8214e820b80225d4ba65a0f8e461