Malicious PDF — malware analysis report

Static analysis result for SHA-256 d324947ce4b9087a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-03 11:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4a5e9f7d1e2e8e250b7f989580e9e14a SHA-1: 1c2da082d8a99aeb753b1bafd6b74177ed3e548d SHA-256: d324947ce4b9087a8762b4d7b5ea51c208c17d479d0fde52f99f8d11e4633b87
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/123?utm_term=makalah+argentometri+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403264/normal_6050388f436a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_602c617422e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_6030d8d70cf19.pdfIn PDF document text
    • https://xexibufit.weebly.com/uploads/1/3/0/7/130739933/8613241.pdfIn PDF document text
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/3e04dc6a.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/kofokarobaropil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_602a878a329d6.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/952af0e7-d811-4770-892c-6b9ff2ab0982/9499187871.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/rogasawij.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/solving_one_variable_equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9866a6-fb36-43e2-992f-83bdfb2d6109/36907348298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30665e1-fbc4-41a5-8171-adf5d0a2c687/how_to_set_up_ring_video_doorbell_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a8567b-cf00-478e-8496-096d10806df2/kisezupegopuxeder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5b6670-45e3-496a-ac77-2ceacca3fc39/62742734076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7c1382-df3c-4351-a769-8398e1cd6343/ar_15_scope_vs_red_dot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07effb07-b3b3-42a4-ada5-1880105975a2/10753691071.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418371/difference_between_direct_method_and_grammar_translation_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2dad63-eb27-404c-8e81-3517a631fb34/38373088992.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_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 5348 bytes
SHA-256: 0eba88c1f816469d9d14c31c6d9fa5b8e9bfb1eee351d61327965b95881f5ab6
font_01_sfnt_off00012de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 10788 bytes
SHA-256: 21e77ad57d69ccd22d3b86576170b15bd9d1f334b3e42074cee0d2908d5ae51b

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