Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac27a36026fdc80…

MALICIOUS

PDF

74.0 KB Created: 2021-05-07 18:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cf3c216e6daab0e6d62a7c9fad651211 SHA-1: da6b9b85a449a9ca03ee20af4ba5272f78f49402 SHA-256: 4ac27a36026fdc80b90506d20778cc1c1850e12a768dd13e147a6166f664d180
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 hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mezovuduw.ru/strik?utm_term=98+jeep+grand+cherokee+laredo+owners+manual PDF link annotation
    • https://rofubedojatedo.weebly.com/uploads/1/3/4/5/134586725/e509dc02ea.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/83645b8d3c52ec9.pdfIn PDF document text
    • https://sakiverore.weebly.com/uploads/1/3/6/0/136095660/6d745ab.pdfIn PDF document text
    • http://jezonikiroka.mygamesonline.org/auscultation_pulmonaire.pdfIn PDF document text
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/fb9f95a3e78285.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/nuzopav.pdfIn PDF document text
    • http://mokuduvejevuz.scienceontheweb.net/applied_physics_1_book.pdfIn PDF document text
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/fesopubomezixep.pdfIn PDF document text
    • https://sezifiloxoxo.weebly.com/uploads/1/3/5/3/135348424/d96fe0e229997af.pdfIn PDF document text
    • https://xuzumuja.weebly.com/uploads/1/3/1/6/131636792/1cc534a2a83e.pdfIn PDF document text
    • https://jevoweli.weebly.com/uploads/1/3/5/9/135958856/5958549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamelaluwer.myartsonline.com/94428819412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21833a0c-b5c9-4275-af5e-236a689f8659/316491665.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_d2bece95f58e455a94cd8289c9370282.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_f76316cff62b49f991a4bb2250f65973.pdf?index=trueIn PDF document text
    • http://xirexadugimog.atwebpages.com/bacteriologia_medica_basada_en_problemas_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b04ead8-70bc-47bd-ae18-aec0878d2073/jugasup.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_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 5976 bytes
SHA-256: 02a67c385311927155746f3939409c402fdc445d463f135a8829788244949285
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 11356 bytes
SHA-256: 9f86e7260997c4874fa4cfe39e7c1e587fe99661608747edeb0c66b884a449a2