Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8309f3d0e3dbbc0…

MALICIOUS

PDF

77.1 KB Created: 2021-05-13 18:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 31af18786414f5f126fa354ac71bf6c0 SHA-1: d67f3bf8abb7d15deb750684029248429c9dc38d SHA-256: c8309f3d0e3dbbc0a768757e1e11ec9ad2dbe785a6d352a47a23df2b35500654
226 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scam, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The primary IOC is the URL 'https://mezovuduw.ru/strik?utm_term=can+we+check+covid+19+report+online', which is likely the initial point of contact for the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://mezovuduw.ru/strik?utm_term=can+we+check+covid+19+report+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482849/normal_60664818b3ab0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366028/normal_5ffb8aa231c90.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/jsXohjp/zifexexagesit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_605f4aa595708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403270/normal_5fdfa72b835ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_604b6c545ad49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366007/normal_5ffe0f15daaf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_605cabb530c4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467027/normal_5fc939d297fd7.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/Ohjjdjj/1558301174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5febd6159cd2d.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/0ify6je/nunoxoseka.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/iephdlv/uc_browser_mini_old_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/gcihiiz/cat_flipping_the_bird_pic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5fd680db0c8bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_a5340d67218248ff908595cc0f913756.pdf?index=trueIn PDF document text
    • http://xopemaw.rf.gd/sazexonekanafokixub.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_1d18d6468b0946059597abf9b6575141.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_c195ebbe239045db821edc085c7f192e.pdf?index=trueIn PDF document text
    • http://satonavuka.rf.gd/navy_uniform_allowance_2020.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_8332a42116094f119eca6c3a1d641368.pdf?index=trueIn PDF document text
    • http://fudinurozoxesa.rf.gd/pemebedopan.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_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 5312 bytes
SHA-256: 5ed3d8a26660572014501e770c48ec6046dfd8660cd3918ca4d6f17e8351f178
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 10684 bytes
SHA-256: 9d9668ac05bd977901e0fe286a61f920df848ce7b086eb280b7cb33370258e9d