Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b69dba717777991…

MALICIOUS

PDF

76.9 KB Created: 2021-03-28 01:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 88c4d318d3653385064b5f9976ab7112 SHA-1: 550da30bfd58f0457b634e4be6356bbebe65279f SHA-256: 1b69dba717777991a274ffa94eb136c5151b825c933f037d36cddf4e6f4aa5c5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=mapamundi+con+nombres+pdf+para+imprimir PDF link annotation
    • https://zalozudipob.weebly.com/uploads/1/3/4/6/134673455/viwaju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393624/normal_5ffb64c58624d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_603fdbf976335.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489247/normal_5ff927fa109f7.pdfIn PDF document text
    • http://zapixexarepol.medianewsonline.com/bowom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_604041041543b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_602a71942f151.pdfIn PDF document text
    • http://muvirire.22web.org/guposaviwele.pdfIn PDF document text
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/311835.pdfIn PDF document text
    • http://besemafobekilir.22web.org/62642007324.pdfIn PDF document text
    • https://kiwewogulexir.weebly.com/uploads/1/3/4/3/134307720/lexilaxar_lenetakaj_reseba.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/nobosunusilopasofav.pdfIn PDF document text
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/rogasuti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409992/normal_5fcf3ae12ba18.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/4a0ba157-c959-4942-b092-1277a6d1d607/39788498579.pdfIn PDF document text
    • http://nufesuku.rf.gd/first_aid_course_2017.pdfIn PDF document text
    • http://salorejim.epizy.com/you_are_not_alone_piano_sheet.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/92632057242.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/3m_tape_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb45142d-a529-40fc-981f-483f0c8a9eaf/how_to_get_3d_warehouse_on_sketchup_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb85bc2f-4f0d-47a2-ae97-2466194a349d/sibefupavip.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_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 5412 bytes
SHA-256: 1596605873a048fb9f2c1959daf038190f800fa64b1c3fb11195ef01021da6d1
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 11824 bytes
SHA-256: 2cf9cc6125344efefa997e35b176b99fcb72d33051ae8dba227ea3008fd64a64

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