Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95b8fb0afecdf43…

MALICIOUS

PDF

87.2 KB Created: 2021-03-12 17:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ebbd4b70fd34e39e191d4b00d45d09b4 SHA-1: 4869d127ce138f2b8e1d3a3bad6c4f05804d92f0 SHA-256: c95b8fb0afecdf4337cbb3fa02c4d33722d39463235033bc92e55dbd25bea919
134 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external URLs, with one specifically related to 'promissory note for loan pdf', suggesting a deceptive intent. The presence of multiple disposable hosting links further indicates malicious activity, likely aimed at redirecting users to malicious sites for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/award?keyword=promissory+note+for+loan+pdf PDF link annotation
    • http://kekijojovif.sportsontheweb.net/zisijebekesoxive.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/fudge_a_mania_free_download.pdfIn PDF document text
    • http://civiliscmq.online/75878414290ctdwt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_603239cb8e976.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464080/normal_6006e2da3137c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fe67861c45eb.pdfIn PDF document text
    • http://wide-mean.top/what_subjects_do_you_need_to_be_a_marketing_manager39bo3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_6017be63b9451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fd652b1b9eed.pdfIn PDF document text
    • http://pornbustyvids.com/bicentennial_man_piano_sheet_musice6hiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_603030809d93b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_5ffe880c71731.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/3365691711.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/turn_off_stability_control_jeep_jk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414491/normal_5fc609c70ea3d.pdfIn PDF document text
    • http://carishr.com/83548647952k91xb.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/clayden_organic_chemistry_archive.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/resasarisumibexuwiwikeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_602baa15e5e0a.pdfIn PDF document text
    • http://plsale.pro/firobafijubavutamepefilajab.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/british_accent_words.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d598b81f-8453-4e22-b631-412e5ff3c668/sunijukitejokevovutexuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2759f18-b0e7-400c-ba7e-4aa20e415706/8249276920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4abc8b-4a83-4b51-ad0a-2abe5100048e/jbl_flip_3_battery_life_problem.pdfIn PDF document text
    • http://rivetibixonapaz.myartsonline.com/zotalo.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_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 5288 bytes
SHA-256: 5589e7e97516d4e7abb9af3daf35d41b08461a8028f4ffcef64a4c34a6b42a76
font_01_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 10788 bytes
SHA-256: 719025dff1a8b6aa4666756dffc18a750b1d3e678721c8122b98994661e73ead