Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f11918fd402bc6…

MALICIOUS

PDF

88.0 KB Created: 2021-03-15 09:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88f24b528f1c0aa740207db997f98f04 SHA-1: 5bc0b1442c2ab6278180f3f9184e8c13028de0f8 SHA-256: b5f11918fd402bc643398e2b9479887be795563c785b9e37c0393df7543715db
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=define+facework+in+sociology PDF link annotation
    • https://cdn.sqhk.co/bularalunop/Ljbjngc/11069754099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480402/normal_5ff52b89393ea.pdfIn PDF document text
    • http://antonioita.fun/nebomokujepeml76w1.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/volep.pdfIn PDF document text
    • http://psylath.com/hp_officejet_pro_k8600_user_manualdxewv.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/jbVibYC/shooter_lube_military_discount.pdfIn PDF document text
    • http://pogadai.xyz/sopinuvelafowatasagapavcqwkt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491151/normal_60421fc8f0301.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/descargar_biblia_septuaginta_completa.pdfIn PDF document text
    • http://kupugula.iblogger.org/vafolojumiwozipofu.pdfIn PDF document text
    • http://onlinesos.tech/hardegree_symbolic_logic76qhw.pdfIn PDF document text
    • https://cdn.sqhk.co/badimoweba/iiif4jc/gukeb.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/VJ27hdC/download_game_diamond_diaries_saga.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleser/kg3NDYF/creative_timeline_template_ppt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_601916cbc74dd.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/magapeguwabe/piwuvawem.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/wordpress_tutorial_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/joomla_free_templates_blog_style.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/sum_of_interior_angles_of_a_triangle.pdfIn PDF document text
    • http://lulasiwafa.rf.gd/vebuwuzupexabomumubedalof.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/gilumoragoresafavezapuxok.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/data_science_and_big_data_analytics_wiley.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/25286694910.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 5308 bytes
SHA-256: b79fe2f00bc4f2189224174f9cefc3dc23b159e97b352431ce01b352a1643092
font_01_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 10644 bytes
SHA-256: 5c6f1af25319650c3acda187fff37e9fd10368730b422e87400aff241ee9d8c2

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