Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b902c6e50c8464…

MALICIOUS

PDF

77.0 KB Created: 2021-04-25 03:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eb269c3ceb05194db1e0050448aad324 SHA-1: bc9a9f6b4c56a4e5bfafce38ae474ef420cc7e8a SHA-256: e3b902c6e50c846467984e69a839e74bb6b24974db8572afb20dfd2a5f53dc8f
226 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, indicated by the ML classifier and ClamAV detection. The document body, though heavily obfuscated, suggests an attempt to trick the user into downloading a driver, which is a common pretext for malware delivery. The presence of a 'Clipboard command execution lure' heuristic strongly suggests the document instructs the user to copy and paste commands into a shell, likely to download and execute a second-stage payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://kuzutuzo.ru/strik?utm_term=realtek+audio+driver+windows+10+64+bit+dell PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369630/normal_602861a6c158e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_6043852e60b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_603d0ed730f13.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/descargar_libro_operatoria_dental_barrancos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60183f0f14234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5ffca2fbb2890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_6056d0de8cc1d.pdfIn PDF document text
    • https://golotarati.weebly.com/uploads/1/3/1/8/131856611/taremizutakugel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60298bab34c9f.pdfIn PDF document text
    • https://dolafevofi.weebly.com/uploads/1/3/5/3/135330218/73e6f58c063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412773/normal_60060665e21cf.pdfIn PDF document text
    • https://wumezovavupod.weebly.com/uploads/1/3/4/7/134741594/8778268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_603064f01051b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_60298b476cd87.pdfIn PDF document text
    • https://siwikuzovusodig.weebly.com/uploads/1/3/4/3/134357046/9514751.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/bc88f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_60433296bd14f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supajiwa.myartsonline.com/48921506996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a974665-b78e-426b-a824-7758386d9752/94534770543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c53b803-dd64-4a93-b05c-8f4076b282ab/bose_321_series_2_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7cd746-01a5-44b7-b52b-c400b0888c12/27569095670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfd669a-724e-4340-b640-50498eb72542/lepavotel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4743216e-2a84-49b7-9df6-cc53e1a3bf93/96779686043.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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5616 bytes
SHA-256: e3b31b845a818ec3bc95c16c9f9db9b5e3cce9f90346ffe29fb193e68ec0ad00
font_01_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 10900 bytes
SHA-256: 1006d980082dfb078cc0b076fd40c38e6906322f7b56b669b9851da31b56c1b4

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