Malicious PDF — malware analysis report

Static analysis result for SHA-256 253abf7fae439085…

MALICIOUS

PDF

68.3 KB Created: 2021-03-20 21:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6baec8912a781746a8d35200a473fe20 SHA-1: 7153236468c807e8146c5094718aabda83a40c97 SHA-256: 253abf7fae439085cf2cd9637261ee69d8d0e7fb28fecdaf1c8ecfbb363d566b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=theory+in+landscape+architecture+simon+swaffield+pdf
    • https://cdn.sqhk.co/gevanadu/aAfihjc/sezup.pdf
    • https://cdn-cms.f-static.net/uploads/4417519/normal_601103a5c5270.pdf
    • http://siwosupegejolop.medianewsonline.com/offline_urdu_romantic_novels_free_download.pdf
    • https://cdn.sqhk.co/pamezuravuno/fiiYigH/91267934234.pdf
    • https://cdn.sqhk.co/juduxijumijo/fLihJE5/82201282477.pdf
    • https://cdn.sqhk.co/kerametunal/ZjedlWw/crossing_the_chasm_espanol.pdf
    • http://xuvepawa.iblogger.org/jojeriwenopifopiziz.pdf
    • http://rozujed.sportsontheweb.net/credit_analyst_job_description.pdf
    • https://cdn-cms.f-static.net/uploads/4474222/normal_60222becd7949.pdf
    • https://cdn.sqhk.co/mepowokugo/Zjagjgh/kavuko.pdf
    • https://cdn-cms.f-static.net/uploads/4404990/normal_5fe8a01aeb31c.pdf
    • https://static.s123-cdn-static.com/uploads/4460461/normal_5fc79fed48441.pdf
    • http://siwupojotuj.getenjoyment.net/republic_by_plato_sparknotes.pdf
    • http://samemere.mygamesonline.org/narepuwifo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kozibowisenatu/52641118299.pdf
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_58650aa63336417ea911cb189b9bf77d.pdf?index=true
    • https://s3.amazonaws.com/vekodupiwarobi/tru_talk_video_song_mr_jatt.pdf
    • http://puwepubofixa.epizy.com/audacity_free_windows.pdf
    • http://lutewefopuv.rf.gd/protocolo_arp_y_rarp.pdf
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_269f18d35dfe44fbb1d1c5e066e53fe6.pdf?index=true
    • http://julisumuxolo.rf.gd/oxford_discover_4_student_book.pdf
    • http://mamuxar.rf.gd/make_the_road_by_walking_menahan_street_band.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0b.bin
5767f7c5b95629a004c85fd7deff77114096a85fffb3c1ae682a687e54a44124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 5540 bytes
font_01_sfnt_off0000dfd2.bin
da8440e537bb5b8521510ae80d940860f7ca499756747c05c713874d38cbc264		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10480 bytes

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