Malicious PDF — malware analysis report

Static analysis result for SHA-256 766aa30276338494…

MALICIOUS

PDF

80.6 KB Created: 2021-05-20 15:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57c5b0c2d8f7f86f7e71cb8bece2c991 SHA-1: 89f4ac8a8edf90cba1a304e3ccbacb82ef87f44e SHA-256: 766aa30276338494a0f290734cdf2377a115b16336691de7976912fb967ccc7f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards the use of JavaScript for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=what+are+the+differences+between+prokaryotic+and+eukaryotic+cells
    • https://cdn-cms.f-static.net/uploads/4501654/normal_605aee7e49923.pdf
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/3610956.pdf
    • https://juponujebiz.weebly.com/uploads/1/3/4/7/134773331/fesazisimifuve_tebizikow_wuvexi_vixidodufek.pdf
    • https://cdn-cms.f-static.net/uploads/4446931/normal_601319517dc3f.pdf
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5fcd7f8b4d820.pdf
    • https://nedovewa.weebly.com/uploads/1/3/5/3/135316636/pejijekagamurit-miwukuzatu-pexozararo-wosebu.pdf
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5ff7cc117f1e8.pdf
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/7a61d2fd6.pdf
    • https://cdn-cms.f-static.net/uploads/4411937/normal_606081cf9c0b3.pdf
    • https://static.s123-cdn-static.com/uploads/4377400/normal_600554652a322.pdf
    • https://cdn-cms.f-static.net/uploads/4448550/normal_602e5d43e8edb.pdf
    • https://static.s123-cdn-static.com/uploads/4366035/normal_5ffacaac95ab8.pdf
    • https://cdn-cms.f-static.net/uploads/4370059/normal_60146223e31e5.pdf
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fcaebd71d363.pdf
    • https://cdn-cms.f-static.net/uploads/4454287/normal_6058e6278926e.pdf
    • https://cdn-cms.f-static.net/uploads/4369645/normal_6020c3ebe9996.pdf
    • https://cdn-cms.f-static.net/uploads/4451556/normal_6032b35fcd521.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a352c60b-84a6-4958-bd0a-75b4b5a77568/2857831091.pdf
    • https://uploads.strikinglycdn.com/files/a87b1cc9-3b31-4786-ac23-9730bd019c8f/edo_female_names.pdf
    • https://uploads.strikinglycdn.com/files/d47a7b5c-7c1b-4397-bf21-8dd4b4e939a1/fasuwugedizikumu.pdf
    • https://uploads.strikinglycdn.com/files/12c72c33-ed51-43cc-a314-66e2736f5cd5/lefil.pdf
    • https://uploads.strikinglycdn.com/files/c6bab408-2cef-4f28-b3f0-5aa3688d33e7/vejemivofir.pdf
    • https://uploads.strikinglycdn.com/files/9bb19952-f38e-4733-9973-d0b074f26249/the_weeknd_beauty_behind_the_madness_first_week_sales.pdf
    • https://uploads.strikinglycdn.com/files/5e0794ce-000f-40d7-b0ff-93618045f4ef/how_to_bluetooth_a_craig_speaker.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede6.bin
dd4c4f6ad2db31f4ca5b31cf502df52e66eb51a5f85afea2c303836e15979894
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 5536 bytes
font_01_sfnt_off000100c3.bin
8c993f0d5d0038386a548028aab55f9f3fa88880fb42e1d887cf8e72d1c89525
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 10924 bytes
font_02_sfnt_off00012623.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 4324 bytes