Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf63db103998b15c…

MALICIOUS

PDF

81.5 KB Created: 2021-05-11 19:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc8571c7b8c053d819b8105e3d16a184 SHA-1: 5b5aaa3df4903754bf9529ad747116f6cb9b22f2 SHA-256: bf63db103998b15c0d0b14a7c183d5d4ccd8b132f20cbe7b122a56e9f68d9813
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and a ML classifier indicating maliciousness. The embedded URLs and the PDF structure suggest a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF's nature and the presence of numerous external links point towards malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=how+to+train+your+dragon+book+set+uk
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/pibapepinotuzu_vuxolu_pitisewuginelus.pdf
    • https://bolegabafewibe.weebly.com/uploads/1/3/4/6/134651697/bofenowil-javuvop-bulito-tanux.pdf
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/kopagexafumenumom.pdf
    • http://spiritstudio.ru/29908876980i5aw.pdf
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/3371e123ddfd94.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://cosmicgig.com/zinerunowududenapakexasa5159u.pdf
    • http://monoga.space/maytag_epic_z_washer_door_wont_lockr1uzw.pdf
    • https://zoxipunawogedo.weebly.com/uploads/1/3/4/2/134235683/604384.pdf
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/lufoxol.pdf
    • http://gufutaca6.xyz/makinivuragadaxulx5sn.pdf
    • http://tiktokhd.design/difenizigazutofbu25t.pdf
    • http://shmelev.pro/spanish_dictionary_booksk6gn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_7e25e49497534b9a8ffb9d14c6191985.pdf?index=true
    • https://s3.amazonaws.com/jenagubadopi/60269885856.pdf
    • https://s3.amazonaws.com/mozirolinitaje/faviwudamafe.pdf
    • https://s3.amazonaws.com/wozoxub/jajpur_road_weather_report.pdf
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_f03bf8efb88741d7b40af33d9b380982.pdf?index=true
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_a963dc323cb64a8698d19257f0e7a194.pdf?index=true
    • https://s3.amazonaws.com/baxegezivumi/catch_me_if_you_can_streaming_service.pdf
    • https://s3.amazonaws.com/xupimaral/bhakti_geeti_song.pdf
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_0641cc8b3377499c8dfecd890034c94e.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_off0000febe.bin
114e017ea008c02a58eef36558ed5f96d5740388cd41fc3ec117ff13415b4bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 5320 bytes
font_01_sfnt_off000110f9.bin
92d6806073c7ede2f688b3586a9d4468aca1cefc4234e35ba1f8389a3b87c5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 11228 bytes

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