Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd1d2573c54bd07…

MALICIOUS

PDF

75.2 KB Created: 2021-02-23 07:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 81c1e65cc7ae0e8df2c7c56f039e2ec0 SHA-1: 7b9e6b42581286e88f9bdef9da9017e5989360b7 SHA-256: afd1d2573c54bd07f6a5d19e4ef8d3b842ac8290fa4f5314a91966a2d0cb5f14
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs pointing to disposable hosting suggest a phishing or scam campaign designed to redirect users to malicious content. The embedded URL `https://druttle.ru/strik?utm_term=batman+kills+joker+for+superman+comic` is a primary indicator of this redirection attempt.

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
  • 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://druttle.ru/strik?utm_term=batman+kills+joker+for+superman+comic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460230/normal_5fd233cba663c.pdfIn PDF document text
    • https://mojetene.weebly.com/uploads/1/3/5/9/135957439/6301295.pdfIn PDF document text
    • http://italiabeach.space/705498848674m0fq.pdfIn PDF document text
    • http://laulu-go.ru/6645817476150loq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5fe98adee4201.pdfIn PDF document text
    • http://lastmarkt.ru/xuwetegebabajp3ujp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ffe8e1fae30c.pdfIn PDF document text
    • http://divuwon.iblogger.org/blender_animation_software_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_600cf0c5b0fb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5fcd8ab23649c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380392/normal_5fed45597be53.pdfIn PDF document text
    • http://fertpin.online/kanujagedokerolevabezeda7oizt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mamibis/9869071844.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/kudededa.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/vuraravuzosonepu.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/14432425455.pdfIn PDF document text
    • http://zuluvegutadetu.epizy.com/arcscene_3d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 5232 bytes
SHA-256: 8913d4c7a59031852ab4617acc5fadd97bd6b422ca93cbb7f5b7d4ec27228c37
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 10804 bytes
SHA-256: e7afb8c8ef14b574d5649e49c101a495b491e2e030c5f5f5d5aca0919625d881
font_02_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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