Malicious PDF — malware analysis report

Static analysis result for SHA-256 87366a3d3809f3ea…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 08:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4399087aaaa702f6cf3ea4d492c447ee SHA-1: 37d4404fdfbba2c07383ec0de24bc53b06ccf53e SHA-256: 87366a3d3809f3ea2e46388e41fc9ae132a80465292de7a70d493e17a8f64ec5
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8993

Heuristics 4

  • 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
  • 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/award?keyword=jee+b.+arch+paper+pdf
    • https://cdn.sqhk.co/lilanoto/booijz2/how_to_make_a_bird_origami_easy.pdf
    • https://vinovebavelugis.weebly.com/uploads/1/3/1/3/131383284/592510.pdf
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/9037971.pdf
    • https://cdn.sqhk.co/dowusutitozi/jbmaogh/best_buy_augusta_maine_geek_squad.pdf
    • https://noduxexoretan.weebly.com/uploads/1/3/5/9/135993764/keloxasisadap_jubexejupom_laxevajizaxeb_danipulinizafam.pdf
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/7848420.pdf
    • https://cdn.sqhk.co/zebenane/dyCjaNG/35890934902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e197e8f1-6cb0-4aa2-8517-37bcada0e6ba/adjust_time_on_citizen_skyhawk.pdf
    • https://uploads.strikinglycdn.com/files/ff1db39e-930a-47cd-9161-07d20a127247/63924630631.pdf
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_80834657562d478b81b39c712c499f0b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c32b3370-22e6-4896-ac71-3957c95cf0fb/cuisinart_convection_bread_maker_cbk-200c.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_ecd034324eb5405096fe8ad18438fab8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84624ce8-f34a-4483-b62a-a906bf24eb18/webazenipozotejexu.pdf
    • https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_47a7f28545d14bc29f2514985f3db320.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9be4b0fe-a880-4d7f-aaf7-652fe5d63f47/rosario_de_las_lgrimas_de_mara.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117cf.bin
d177696a2a3a0beb87f02641215f45b54d10181e9827b85ce9a760222344ae67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 5192 bytes

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