Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bdece2ef949975…

MALICIOUS

PDF

124.4 KB Created: 2021-03-22 19:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d5123b55d318ae102831a7c22c2d0512 SHA-1: 5069e6b7ce26b8e2241aaabbb56a810be3d021f4 SHA-256: b9bdece2ef9499752f79a91a2aa70bebf6434e9e90139b246d06385777790c28
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jumiwimov.ru/aws?utm_term=how+is+god+described+in+the+old+testament PDF link annotation
    • http://fibipowokogo.sportsontheweb.net/ansys_cfx_14_tutorial.pdfIn PDF document text
    • https://loruwudo.weebly.com/uploads/1/3/4/7/134738316/dutusowivi_wuxasovirusupim.pdfIn PDF document text
    • http://mibotirekusiw.mywebcommunity.org/74688327045.pdfIn PDF document text
    • https://vezejajanobel.weebly.com/uploads/1/3/1/6/131606482/453236.pdfIn PDF document text
    • https://monogelifanalo.weebly.com/uploads/1/3/5/3/135387447/jobokilozujobok.pdfIn PDF document text
    • https://wawotuxela.weebly.com/uploads/1/3/4/3/134352856/8222785.pdfIn PDF document text
    • http://salearea.pro/355633392822i47x.pdfIn PDF document text
    • http://kayikciakademi.com/holy_name_bible64v1o.pdfIn PDF document text
    • https://wilumixomili.weebly.com/uploads/1/3/1/4/131483065/tepenabixixobakunije.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/alfabeto_griego_biblico.pdfIn PDF document text
    • http://copyrighthelpptteam.com/zirojowalodaboxorakifs5f.pdfIn PDF document text
    • http://vanlit.ru/computer_network_technician_salary_texas9psc2.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/zakunafu/30858075276.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_49ab83d7ed184253b0a1986ffeac65b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kumasala/gexavuxawemizan.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_fc95fc215bf54391a4f49ed563f01e97.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_969336f8bf0d4699ab2687c343f9539e.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_c69ccc4dd818400790c390760b03f9f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/girlfriends_guide_to_divorce_season_4_episodes.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_988408d0b0f94411a0c1555c1ab64f79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patilawasu/amebiasis_2019.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_1202d7c79d224dca96c1dc11273ddf82.pdf?index=trueIn 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_off0001a494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A494 5544 bytes
SHA-256: a8e9d2885a5141e9a42787a946fcf3785ef926049851f4e6b7bbe3bebc0cf8cf
font_01_sfnt_off0001b758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B758 13732 bytes
SHA-256: 8bb71e338bf42d95fe093fd71ca59475abdd52e6a8af53ed70876569b77730e6