Malicious PDF — malware analysis report

Static analysis result for SHA-256 040bb1c9b960494f…

MALICIOUS

PDF

84.8 KB Created: 2021-04-19 03:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 68d26e4e7a178e8185fb69fa599d6786 SHA-1: 9b79afe201300378f62c9b616a111463d2d2c5f5 SHA-256: 040bb1c9b960494f1ab2d0739c08b303ddcb68de2137c184bf37c80abd06783e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+change+font+color+on+brother+p-touch+label+maker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fc8639a59726.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/esl_appearance_worksheet.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/25931900508.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/pNih5x9/7237188797.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/ff5XiaT/54564676983.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/motur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492253/normal_6034d2de3eeb8.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fe99c131f09d.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/63501841602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senesijosezetu.myartsonline.com/wutisojotafoduju.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/7700835469.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_086f821ec5cb44e6aff28913298891ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0251ac2b-40a2-48fc-a74d-4c3890ba94ec/korevuzupepowolunilunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9414b8cf-3674-4c69-bd99-b2d6eb9342be/what_is_the_order_of_the_warrior_books_by_erin_hunter.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_e58f303b22cc461aa0d57643a6144c44.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_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 5540 bytes
SHA-256: 1952ada971fe69e324e656e3b221b2214ddbcab3da0c994e53c3d825adfe304f
font_01_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 12584 bytes
SHA-256: b2723b63ee0fddface26ce16760bcef34fabdd5d0c692f03548b4b16bd66f3a2

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