Malicious PDF — malware analysis report

Static analysis result for SHA-256 25794bec7a3d288c…

MALICIOUS

PDF

83.2 KB Created: 2021-05-28 22:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e9fb4c6d92419e6d9a0993583ad97204 SHA-1: 6cd51100fdf1f9782797a58f11170dcd8e01373b SHA-256: 25794bec7a3d288cda274f37e477aef89d92f55468661f3d904b36dc38735238
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=descargar+super+smash+bros+64+para+emulador PDF link annotation
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/10da8ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5ff918319ba7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_60315834eaa87.pdfIn PDF document text
    • https://xurigatunirefor.weebly.com/uploads/1/3/4/6/134635133/08a806cecbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490132/normal_5ffd44a749686.pdfIn PDF document text
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/pufovewaluwefavajula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421614/normal_60064dce942d1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4390323/normal_60b094f8446a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_60198095e69dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_602544620a796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_60506d7ce1668.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/7259405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484107/normal_603d37f2a66b0.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/3739158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478703/normal_5feb3c3b5c97e.pdfIn PDF document text
    • https://rurirenaw.weebly.com/uploads/1/3/4/6/134652156/volunerewel_pafugidimerad_puxiz.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4454438/normal_60b139635884d.pdfIn PDF document text
    • https://fevadejo.weebly.com/uploads/1/3/0/8/130814338/b39d7.pdfIn PDF document text
    • https://jibeguviju.weebly.com/uploads/1/3/4/7/134723477/2563848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_603ffd1b3af61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fd2689e6f40a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/847a2074-2f8d-456a-9d39-f3eafc663a8c/sharp_objects_ending_scene_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7e62b6e-92bd-4e35-80c8-6b1e93757ba9/31566880716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b292211a-52dc-4487-a34f-0e61c1b7296b/nulebujepixukutu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 5516 bytes
SHA-256: 1921489d5cf6e8c045e24cf2a0723f7ec836c9bf106da402ba5e8c6688016d71
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 11228 bytes
SHA-256: d0f315712d67278c8da31b52e156b9be7a7544de55ac0a595eb0e36b80b92c8c
font_02_sfnt_off00013089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13089 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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