Malicious PDF — malware analysis report

Static analysis result for SHA-256 a373cdfad8af7aa7…

MALICIOUS

PDF

68.8 KB Created: 2021-03-25 12:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ef45c2da4a615474a563d73a0ee08ee9 SHA-1: 287fdde2dc21f23615ae428c58499cd9b1fbeb79 SHA-256: a373cdfad8af7aa757a6be28a4ccd9822c78593571d7de3620147a9a72059b63
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as a spearphishing attachment.

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://xajibur.ru/strik?utm_term=integrated+chinese+1+textbook+simplified+characters PDF link annotation
    • http://trafikcezaodebayisi.com/81456049316w5fvi.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/algebraic_equations_grade_8.pdfIn PDF document text
    • http://kininorekuwif.iblogger.org/37275770061.pdfIn PDF document text
    • http://gunasog.iblogger.org/48040506536.pdfIn PDF document text
    • http://padlamadla.site/formal_evening_dress_uk4itwb.pdfIn PDF document text
    • http://detonic-romania.website/grammar_projects_for_middle_schoolhs92o.pdfIn PDF document text
    • http://vizezokope.iblogger.org/lurijikejabepefavujup.pdfIn PDF document text
    • http://xitnet.fun/80781523861y7flx.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/16590205299.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/accounts_payable_clerk_interview_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumumewevebav.epizy.com/alphabetical_words_worksheet.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_e713cbbab75740bfb571908fb255bb9c.pdf?index=trueIn PDF document text
    • http://dipagepe.atwebpages.com/jamiwiwuxuzofolarizafilum.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/wusozewiferozetiva.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_d93f226c573c44579b940378f6585a20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd46c511-1ed9-4fb7-9740-9f412c1eb431/lost_child_dream_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4f5620-1134-4356-a1aa-679d52ebffa8/liwawusawamig.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/31755610914.pdfIn PDF document text
    • http://towuvoti.epizy.com/83434650028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4547160a-9cef-4d73-b926-181dc89eaf29/12170063564.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/fojanujota.pdfIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_71bf93cab98247f7be328e335db98fa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48e85d8-d5d4-45a8-98b2-463f4fb7cce7/vabufugukevopu.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_off0000ca44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 5828 bytes
SHA-256: 2551c0b59e414c5f5534e44cc9690884fafdffdbc9246dbf3776b47c24426824
font_01_sfnt_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 11088 bytes
SHA-256: 361be6fd861d361bd7143f502ba1f6157cc78b799d34a374427013a83b680b14

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