Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0d13db808675b0…

MALICIOUS

PDF

81.5 KB Created: 2021-04-18 13:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f541a550d0961003473e7bbae1bc5b8b SHA-1: 20b059967430bc4aced2d1916ebaf0a587343d3e SHA-256: bb0d13db808675b02587ba9cb5489bcde65afa6855f27bc8f1b1edfe5fc7c747
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing or trojan distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=lakshmi+narasimha+stotram+tamil+lyrics
    • http://domavera.ru/a_guide_to_managing_and_maintaininglanre.pdf
    • https://cdn-cms.f-static.net/uploads/4379846/normal_6024b29c9c277.pdf
    • http://lovemecompletely.com/ganesha_sahasranamam_telugu_mp3_free_download9bzun.pdf
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/bujipogir.pdf
    • https://xiwikufebalub.weebly.com/uploads/1/3/1/4/131438050/3546501.pdf
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/16c18c3bd5960.pdf
    • http://xifuponek.iblogger.org/how_to_start_a_comparative_analysis_essay.pdf
    • https://sufepupebesi.weebly.com/uploads/1/3/4/6/134636280/2563067.pdf
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fccd2ed858c5.pdf
    • https://cdn-cms.f-static.net/uploads/4421038/normal_606bd2e4685c4.pdf
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/2518172.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_190d7d882f1e42c0ba813af3bca5fba5.pdf?index=true
    • http://gukojubare.rf.gd/past_participle_irregular_verbs_worksheets.pdf
    • https://s3.amazonaws.com/faxaxos/81386803874.pdf
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_7a4d16f94aae4cb0aafe41bb45d574e6.pdf?index=true
    • https://s3.amazonaws.com/saziwijaxodav/79574148436.pdf
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_bc4fd0ac93ba4c388f451bad10f0ee18.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_3b4c00f9f40b47659e7851dba9471e00.pdf?index=true
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_fcb1febfdb8a48be9cd8db0dc184fc7d.pdf?index=true
    • https://s3.amazonaws.com/tokatefozude/nelotatanetarinoso.pdf
    • https://s3.amazonaws.com/kozibowisenatu/hotel_housekeeping_tip_guide.pdf
    • https://s3.amazonaws.com/jobavo/jeburukepefosul.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_off0000ebec.bin
d2df2318b782fe12db0bd94fd4cf37b425f6722f7a84bd286fdeb45bf5a9f750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 5144 bytes
font_01_sfnt_off0000fd4f.bin
0fbb136b9ea201d3bde8dcda6ec723767f2f2baf17bf893b383f32c0c9537339		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 10800 bytes
font_02_sfnt_off00012249.bin
989aad4ca33cf61d0371fad402fc2a61ed74233b00f54b43e8425e0d2084009f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 16228 bytes

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