Malicious PDF — malware analysis report

Static analysis result for SHA-256 7984d5b9613b94aa…

MALICIOUS

PDF

67.3 KB Created: 2020-11-17 21:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5c260bd3afd7c69df609f7dffd70f976 SHA-1: db10fe8b9c0f9c7b9a6f82d4d7e58e3575b666d7 SHA-256: 7984d5b9613b94aa4d5c4acc9d3a37bfe300099b9d662f7ba9b767987947bdbc
156 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 5

  • 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.
  • 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://traffset.ru/strik?utm_term=the+true+story+of+the+three+little+pigs+pdf PDF link annotation
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/vugomofuputi.pdfIn PDF document text
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/9617556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5fa3ef5e6e79c.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/ribepodo_vajukesawe_wimipegiduwut_sivaxube.pdfIn PDF document text
    • https://basivukapipex.weebly.com/uploads/1/3/4/5/134528325/pujaxikajopusibukiz.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/499599ce-98d8-47a0-9b76-ce49188505e5/current_gk_in_hindi_2013_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d7fd78-ed0b-4fbe-890d-753a84a0f3bb/pixel_art_person_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d27cdc-da96-4802-bdeb-c4185534051a/vejifupefula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7923d936-4817-4ed2-91f8-9d14a453e0c5/81234352484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2824ff37-f526-4729-83e4-9337dc78a4a3/mokujijizofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382acaec-bbb3-4e55-aae4-b8cde4a53cef/vorave.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_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 5144 bytes
SHA-256: 62c9c05869f0b899f9d4381e869564863c3a2ba96deefa64c61735bbc141fe53
font_01_sfnt_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 10392 bytes
SHA-256: b93c0f77b8bcfbe300cbe62b111c763530663768101ccb1d81a76e3073246698

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