Malicious PDF — malware analysis report

Static analysis result for SHA-256 569633d96f5c80ad…

MALICIOUS

PDF

81.0 KB Created: 2021-05-12 15:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4c2f8f1768e00b39aa2b9cc0a35d4f59 SHA-1: 6a6fbeac96fcbf1a0bd1b91bfc93c4e336703b2a SHA-256: 569633d96f5c80ad81946145c0a5ba0e1ad3fd00fc09e777a53a5fae76fb1c97
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing for credentials. The document body, though heavily obfuscated, contains references to 'Thirteen Reasons Why' and 'recap', indicating a lure to attract user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://gimoguvi.ru/strik?utm_term=thirteen+reasons+why+season+4+episode+3+recap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447434/normal_602b836a0b085.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_5fee2be9b8f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_604e59eb4ec95.pdfIn PDF document text
    • https://juxokiwi.weebly.com/uploads/1/3/4/5/134594748/4629881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_605478210e5c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_603960775eff0.pdfIn PDF document text
    • https://gufurokis.weebly.com/uploads/1/3/1/4/131453316/867c50ad9fb3a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_600dd82459e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_602e1a7b4658e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_60486e2504bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_601703716fa30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_5fe9e3af6e307.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://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_135df5869a95473994c222cbfbc019b6.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_196304eec86343d8ac2480413008c46c.pdf?index=trueIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_e1694ed29eb94f4381ec7bf5a7c3f51a.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_0fed3d5e6b244c62affe0b3eb3e06bec.pdf?index=trueIn PDF document text
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_8a19888ef7a243c3817f38bb215e0d50.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_e14b2a44bca04f2f991aac75e0c3482a.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_de6b1cfa65494e9ab719bb90708f7f4b.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_c4677e98a1c24150bab6b5d7d21f4028.pdf?index=trueIn 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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5312 bytes
SHA-256: 404b0eabe89863acaa83e35fc12b6477f5102715ac429a8ac1d3e6a565b81052
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 10724 bytes
SHA-256: 82039b26f9a4af8b9639642ca7c9c94ab2a7f7f63d503ae0f45bf26b0868be2d
font_02_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e