Malicious PDF — malware analysis report

Static analysis result for SHA-256 2baa9c8562a62307…

MALICIOUS

PDF

126.0 KB Created: 2021-03-14 14:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0a55d93e6dad0f25d57500feb2289ebc SHA-1: 44cf356d00f807272085ef078839810c0007992d SHA-256: 2baa9c8562a623078945b9b2647fec02e9ef7f46855dc444e9dfdbde424cb832
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution through the linked PDFs. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/award?keyword=atalasoft+pdf+rasterizer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5fd9e54942a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_600bca1f92f8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5ff857e78fb80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_6018e337d1ae0.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/xafubabukilotev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_6045c2bf8ba2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_600a51e2b17a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376857/normal_5ffa9cef8e4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_602b7c6d08c27.pdfIn PDF document text
    • https://tajidirubizev.weebly.com/uploads/1/3/0/7/130739153/9f0b968.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/5978033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_603d081bb6142.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/a9aab978f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_604185dad5d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_6032c95d3591f.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/110e8960344198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_600bd3d16fe14.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/2b6454c5-db99-4b3e-85cf-65bff17fb0eb/vakizalizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ecfd6b-b04d-4c6a-8ccf-fb91dcfc225d/how_do_i_study_for_my_real_estate_exam.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_419399f9702248a5b26fdbc0e4cd4d7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45373592-bb59-4f5c-8503-1dba4ef6f10f/nadirikerepabopapobofok.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_2574d372b6a64547ae320480c8b680a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad953bf-0031-4b93-9e6a-92d5aa409e51/effects_of_climate_change_on_human_health_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0383829-3dc6-44ef-982f-101aabeb1d95/kitebedape.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_off0001ae78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE78 5076 bytes
SHA-256: 88f9ebe339c4194a76b374a81b973def602eee6e17fde2377ccfe7db9c7a3e30
font_01_sfnt_off0001bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFD0 12440 bytes
SHA-256: 0121a81d9a1ce0be7388a794a674f4a0a22c05adcd187d4c63248b9818154a05