Malicious PDF — malware analysis report

Static analysis result for SHA-256 431f4f272b72c9b2…

MALICIOUS

PDF

75.1 KB Created: 2021-03-31 02:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe57bb0dab0d8d87205b012c672ae769 SHA-1: e0468987fe1d558c236040abe17f6a15352fa286 SHA-256: 431f4f272b72c9b2e355e2e1775a920aa68acff45328f3de428bda6b47d2de2e
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that redirect to external websites, some of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of multiple suspicious URLs and the link farm heuristic suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=how+to+fix+a+washing+machine+agitator
    • https://cdn.sqhk.co/vozeseseber/ifjcQRa/zukavepesabez.pdf
    • https://static.s123-cdn-static.com/uploads/4392666/normal_6005e1a92735e.pdf
    • http://baltika-trans.ru/kalexunesonovexapexagx2ay5.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_601d86893a512.pdf
    • http://sweetmeet.online/fawowabulilejomezita3y6q.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5fe0194b830f4.pdf
    • https://cdn-cms.f-static.net/uploads/4462730/normal_6058e32e7b94a.pdf
    • https://cdn.sqhk.co/merutigujet/iifhcge/18158641432.pdf
    • https://cdn.sqhk.co/nananava/qjcigFn/tmnt_mutant_madness_best_team.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_c8a02c5e691449b4b5b2812dc6347857.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5bcd54b-4104-4aba-a875-421003682c26/88024281524.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_fe214f285b7243dfa3d8e4897f4c2c9d.pdf?index=true
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_d1b894578f644760b4a65603f34bd63a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39123974-9397-438b-8f1b-f2c91fc27035/compare_and_contrast_the_structure_and_function_of_arteries_and_veins_quizlet.pdf
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_2e66f6bbf77946229a1031b3a19a32e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e04ff87-b1e2-400a-b60d-74a8897d7115/mirro_pressure_cooker_gasket_m-0534-11.pdf
    • https://uploads.strikinglycdn.com/files/557ae185-3725-4745-94f5-7f05b3dd11c2/sat_chemistry_book.pdf
    • https://uploads.strikinglycdn.com/files/fb7a5f4f-e333-41b9-b2f0-0cffb01461c2/99684313428.pdf
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_2b688db13f9f4a219a525c5269fee564.pdf?index=true
    • 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_off0000e8d2.bin
f469fd1fc303de991d200b46a7bb287fc9d938053363b562c6e98b31890e78db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 5384 bytes
font_01_sfnt_off0000fb13.bin
c21eab65e1a1fe77fa36cf43c9a94af8c21276eee6cdde4facbaa9ebfa69b1a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10536 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.