Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b982a818c9953…

MALICIOUS

PDF

85.3 KB Created: 2021-05-16 01:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8ab9514db51dd382770968750b7d2aac SHA-1: 247c49b49596beabeeae66fd3b03142c68d137ae SHA-256: bd4b982a818c99535b83d164e1fbd23ef49cdaf26f1de99515b21443e017b000
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, including one to `vilenefex.ru`, suggesting a phishing or SEO manipulation attempt. The document body is heavily obfuscated and unreadable, but the presence of numerous links points to an effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=which+george+foreman+grills+have+removable+plates PDF link annotation
    • https://cdn.sqhk.co/winelolibug/hhgeLRq/88056770835.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/bEjcZl0/simple_online_to_do_list_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5fcb6b39ab47e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_6044d7e926951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374207/normal_600015388a451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_5fdbc36732fbf.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://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_20e98ffccca3435ca631d055b2ddce9f.pdf?index=trueIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_c4ee84a44d38433ca939edf5dad8129d.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_21afedbcff024dbb952fbc929ac97965.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_86f35b90bf014c68b45b2a8f8a531a3d.pdf?index=trueIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_dea71a3779804a068105c19e1ad22f11.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_6014cc47a31f40f691231ece377a5bc4.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_f8c860ea1e7b47418a221bafefce53d0.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_67f076bad5544219a0684fb77efc7bc9.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_50c48038f94b49f68f0ab8ab219452c9.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_549113ebd21b4e3ab202d33e84d1908e.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_dbec4ce24d4c4e5f8892fafb1ed2ce97.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_41d804a8b82443379b44cb938ea8cefe.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_2d665a14f12544f0b96b22251af3ad38.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_8f02d1c7ceeb48dc87d053038ffc20f9.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_c0d15e2363ed452f934ea0e97ceee342.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_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 5432 bytes
SHA-256: 67658822b901e9c5256289829384c40d73c6982eec8d52ee0f326e7a6ed81335
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 11644 bytes
SHA-256: 57de726fba738d5fe56ad6b7c8aafc9860a7ab34d1b69d5fc36936699f37db6e
font_02_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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