Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbc396f8ec76c9d…

MALICIOUS

PDF

67.1 KB Created: 2020-11-10 20:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 67b8f167cfd4a430576f8e6540638beb SHA-1: d03b4738c594fa59408ca673241ef8ef7cf68520 SHA-256: 8dbc396f8ec76c9d53805aa1ac67cead2778e3f28dd70369e6ba8d8f2b192fd6
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of linking to external sites, likely for malicious purposes such as phishing or distributing further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=free+rp+codes In PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/jukixib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f95e7ff28504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5f9e8eec2f99e.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/4cde6da1-78c6-4544-afcb-570123241384/68129434305.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/chilling_adventures_of_sabrina_season_4_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27d4aba-6d52-4079-b870-48fa4a8095d2/mufobinalidisefamopuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af965e04-6364-4bfd-8073-661d335f8c1a/29785619423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e329c76e-8c54-4716-8d0d-12e158c43e0b/espada_de_cristal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4c58c6-efb3-4a73-9a40-ad9c20081642/fivosoxipexexixor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5330c506-dd4f-4cca-984f-4f092d4e25fd/retropie_save_state_hotkey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486555ec-430f-4de9-9217-2d571b52dd93/41579843011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df32ccb9-8166-4db2-a384-fc835177d627/sobigejonarapodefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6194a904-0b97-4d50-82d0-f976bf07306b/javebalujaxobofazowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936ce55b-79cf-4bad-b430-826bc5900218/tadafigosigad.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_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 4780 bytes
SHA-256: a801518fc801a3599593c8872bcec207994cb002b9844f1fa78553608afbfb02
font_01_sfnt_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 10500 bytes
SHA-256: 79d39b8e569e3486828a89f7e130df5ce1b85a86623150b09bfac8ebac58c601

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