Malicious PDF — malware analysis report

Static analysis result for SHA-256 275262e6da31ed6a…

MALICIOUS

PDF

83.8 KB Created: 2021-05-23 11:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f732eeb8c6f09494669b97e21d789c03 SHA-1: d421f108d1ce051f2521780f7535f7b06a5c3d5c SHA-256: 275262e6da31ed6aa94c8692e79cd7424c4c1643a01549b9491ca829c737fb5a
156 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 PDF SEO link farm, suggesting a malicious intent to manipulate search results or redirect users to potentially harmful content. The primary URL, 'https://jumiwimov.ru/strik?utm_term=brokeback+mountain+pdf+free+download', is likely part of this scheme. While no scripts were directly extracted, the PDF structure and the extensive link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=brokeback+mountain+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4446924/normal_6059cca88ee99.pdf
    • https://static.s123-cdn-static.com/uploads/4485799/normal_5fe2dda79cb16.pdf
    • https://cdn-cms.f-static.net/uploads/4369315/normal_6026096028c43.pdf
    • https://kifakofaw.weebly.com/uploads/1/3/4/0/134016777/boban_ruvaser.pdf
    • https://kijesutezex.weebly.com/uploads/1/3/5/3/135328712/6036360.pdf
    • https://cdn-cms.f-static.net/uploads/4379048/normal_603bcf6377337.pdf
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/tokire.pdf
    • https://static.s123-cdn-static.com/uploads/4403119/normal_5fc72122dd3c3.pdf
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/zorivabakizilaziwaza.pdf
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/kaferozalowajo.pdf
    • https://cdn-cms.f-static.net/uploads/4372707/normal_60673e544d32d.pdf
    • https://pumavamevimi.weebly.com/uploads/1/3/5/3/135391045/vupejefoki.pdf
    • https://wodokapiv.weebly.com/uploads/1/3/4/5/134584818/cf8621.pdf
    • https://watixure.weebly.com/uploads/1/3/5/9/135991760/luduw-bijozowiporumi-mebuvivibexa-guvabo.pdf
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/79a68b767e0.pdf
    • https://vipopatovosidop.weebly.com/uploads/1/3/0/7/130775456/pobuvuduki.pdf
    • https://static.s123-cdn-static.com/uploads/4490133/normal_6003f816515f1.pdf
    • https://retujofidevi.weebly.com/uploads/1/3/4/6/134621577/vegozumokajutom.pdf
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/taloduzetife.pdf
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/3801233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/935e3ab9-0dc7-4e2a-87de-567aeff288fb/fios_remote_not_connecting_to_box.pdf
    • https://uploads.strikinglycdn.com/files/650c5f05-6ef5-4252-be9c-7c4ad4f27c1c/how_to_store_solar_thermal_energy.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa52.bin
27cb3be954c64679d25199374ddb468c5b40a0bad09ec110cf41cced617f8f7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 5468 bytes
font_01_sfnt_off00010cea.bin
ed0efedf84806c24e3bc1e67289d0c1730cb23f6f9f609fed01ca4aca4a6a94b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 22096 bytes