Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebe2e5b3374ce9e…

MALICIOUS

PDF

80.0 KB Created: 2021-03-19 00:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db725826b24a1c7437feb025e46f4ace SHA-1: 690f945dc0a8059ed1495407b5550e432ca4d8b1 SHA-256: 4ebe2e5b3374ce9eb4fe5df84a18ca549b19c73a19ea9a7f0ed9fedc20917e90
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' heuristic, pointing to various PDF files hosted on external domains. One of the primary URLs, 'https://seumenha.ru/award?keyword=novo+biotin+bula+pdf', suggests a lure related to awards or biotin, likely to entice users to click. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=novo+biotin+bula+pdf
    • https://cdn.sqhk.co/fuvepelela/CLhhcjc/36231132742.pdf
    • https://cdn.sqhk.co/suvotoruwot/wgjgUof/dutiwi.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/xusilunogezomik.pdf
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/banod_gulusakupa_bajage_mamaxo.pdf
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5fe341c50614f.pdf
    • https://cdn.sqhk.co/zanotunuzi/genogkO/desh_bhakti_song_ringtone.pdf
    • https://cdn.sqhk.co/xejudawadoni/clb4hce/todo_cuero_panama_rio_abajo.pdf
    • https://static.s123-cdn-static.com/uploads/4443357/normal_5fdeb165b5894.pdf
    • https://cdn.sqhk.co/pegebatanuz/Z8jh6jw/duetto_ato_setup.pdf
    • https://cdn-cms.f-static.net/uploads/4424637/normal_60137bc808764.pdf
    • http://trixy-matrix.space/57142231606kq26x.pdf
    • http://leafester.online/225834786565f1k8.pdf
    • https://cdn-cms.f-static.net/uploads/4454180/normal_601e6fd902dc2.pdf
    • https://cdn.sqhk.co/fefamuve/j8ZAvjf/lyft_driver_california.pdf
    • https://cdn-cms.f-static.net/uploads/4453144/normal_603711b6a7f9a.pdf
    • https://cdn.sqhk.co/soxuvezosapa/c8jcVgc/90186719792.pdf
    • http://getplafond.xyz/arduino_uno_specificationsi0zq2.pdf
    • http://meetsalle.xyz/xizetowomimasenagx0nyu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/furunumaroxun/affairs_cloud_current_affairs_april_2019.pdf
    • https://s3.amazonaws.com/pesetufavo/gib_aqualine_sheet_sizes.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fe.bin
4e0973e3ede02f62b8fddfa5613f2ed82e366e337d4b3e45453be7dc4758e847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 4928 bytes
font_01_sfnt_off0000f1e3.bin
1cbb1aa9c9ed778e3f60ebbcd1ee4379257b4f3eff809b40a356db2961877a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 13856 bytes
font_02_sfnt_off00011b85.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 16204 bytes

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