Malicious PDF — malware analysis report

Static analysis result for SHA-256 223a2c4d992461ab…

MALICIOUS

PDF

66.7 KB Created: 2021-06-09 17:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ac6e672fb2b7f6f575246f5f44c3792 SHA-1: 6c4687f3a45c37fb4d3920d1f4a4bd6a1009c56f SHA-256: 223a2c4d992461abb80a6243db4b5ec23dadfe80abdefc1431534907b1ded943
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a search result for 'Boruto volume 1 pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/pbw?utm_term=boruto+volume+1+pdf
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5fef925aa072c.pdf
    • https://cdn-cms.f-static.net/uploads/4393503/normal_5fdb0dc913390.pdf
    • https://kugavibutatabo.weebly.com/uploads/1/3/4/6/134613496/xedesevinaluvudaveb.pdf
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5fe8cf2642dfc.pdf
    • https://cdn-cms.f-static.net/uploads/4470975/normal_6034d4db48c82.pdf
    • https://cdn-cms.f-static.net/uploads/4461525/normal_603921099d8ee.pdf
    • https://cdn-cms.f-static.net/uploads/4424666/normal_600cb4ce45134.pdf
    • https://cdn-cms.f-static.net/uploads/4459163/normal_5fd663b37e169.pdf
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/abd30.pdf
    • https://cdn-cms.f-static.net/uploads/4490739/normal_600a856b01e78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/de9d66ec-7311-4117-88f3-e155cc676620/57847563961.pdf
    • https://uploads.strikinglycdn.com/files/d09d6473-8c74-47a2-9fe4-d6a0f0bdac4e/68227855642.pdf
    • https://uploads.strikinglycdn.com/files/10371e33-079b-4a22-ada9-b297e9ebd35a/how_to_get_a_class_c_drivers_license_in_illinois.pdf
    • https://uploads.strikinglycdn.com/files/19fc5022-f2da-48d4-92f8-9963320dde27/what_story_is_rumpelstiltskin_from.pdf
    • https://uploads.strikinglycdn.com/files/648c12f2-acbc-4061-816c-adec090e4953/nasb_macarthur_study_bible.pdf
    • https://uploads.strikinglycdn.com/files/a49d6b53-8cc8-4780-bbae-d2a83c3e3a21/xerox_workcentre_3325_toner_cartridge.pdf
    • https://uploads.strikinglycdn.com/files/f46f5e5f-e651-4998-b9b6-d0b487095169/wall_street_journal_prime_rate_graph.pdf
    • https://uploads.strikinglycdn.com/files/0a18e386-1694-4a88-8ac9-10f8f08d86fd/1783-etap1f_single_mode.pdf
    • https://uploads.strikinglycdn.com/files/a986a172-a9f6-47df-b299-f3ac9105a23c/15905664368.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc01.bin
4ba9e6715b36248a9dee6a8d87ac5c1cd04cc8e83e288818b557c1cd855499b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC01 4960 bytes
font_01_sfnt_off0000dcde.bin
880311aaa9accb615a93e1f369eadc0c4af1ebe0ac55b37c9fb76ef78c18d6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 9624 bytes

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