Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa30ec9713d2424…

MALICIOUS

PDF

84.4 KB Created: 2021-06-08 08:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bb2ad556b60646fba34979d7535543b2 SHA-1: e4366cac7c258b07600908eb4ca154c17390f753 SHA-256: baa30ec9713d2424f93cd386d330b56960d396c2803ac7853aeda6dd51f0e2b9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/pbw?utm_term=how+to+find+the+enthalpy+of+a+solution PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4368249/normal_60b3b3996ad27.pdfIn PDF document text
    • https://puxikatekeji.weebly.com/uploads/1/3/2/6/132681322/431856.pdfIn PDF document text
    • https://gerapulopenun.weebly.com/uploads/1/3/4/5/134587141/4806536.pdfIn PDF document text
    • https://kasutuwisuruja.weebly.com/uploads/1/3/1/8/131872017/9d8d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454682/normal_5fee3ebc705d4.pdfIn PDF document text
    • https://jemodenot.weebly.com/uploads/1/3/4/5/134528334/7055920.pdfIn PDF document text
    • https://binoxumo.weebly.com/uploads/1/3/1/4/131452823/9ac44e0aa.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/6b05a3ca-d76d-4592-9417-97e8786ecf9b/logitech_z-2300_remote_control_pod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dbfc74e-ccb5-4565-9474-84f1904e79e5/quick_start_guide_for_amazon_fire_stick.pdfIn PDF document text
    • http://simaduwu.pbworks.com/w/file/fetch/144842958/600_profecas_de_benjamn_solari_parravicini.pdfIn PDF document text
    • http://nekimijazom.pbworks.com/f/is_audi_e_tron_worth_it.pdfIn PDF document text
    • http://motekus.pbworks.com/w/file/fetch/144708006/febulaxejotaped.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/f/78320979055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b68027-5adc-4a24-a31e-6c8b3c2913b1/21322516108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f16671a-5309-4f3d-9ccb-756f02ca0929/42943574732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ed13bb-782c-453a-ba36-f2dc3a8cd3af/24623933654.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/richard_m_snider_reign_picture.pdfIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144538083/denafujizozuxigexikevujam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf04d8ef-6a76-4463-a689-ba364a5fa501/63444077320.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/working_principle_of_submersible_pump.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_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 5188 bytes
SHA-256: 80bcec1cd5d318f60c6a79fe330b40f55f4797aa3456a154eb1bf0316c706603
font_01_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 11616 bytes
SHA-256: f0a734e46050d6545efac23d726612681e4b977d6ab03a126afddfb7b84ebeda