Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d8b9b7110554a1…

MALICIOUS

PDF

78.0 KB Created: 2021-03-13 20:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e77f2be7988ea4ad0977d866d3524f1b SHA-1: 95b6a19b608c5380446549b04977bd94ff540762 SHA-256: 09d8b9b7110554a1ab5c3481109439009a6efc7f8070313d336d87da195ebe2b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of an SEO link farm or a phishing campaign. The document body, though heavily obfuscated, contains references to 'Debenhams valance sheet' and 'wkhtmltopdf', indicating a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/123?utm_term=debenhams+valance+sheet PDF link annotation
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/lufumit.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/57620501532.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/bittersweet_symphony_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_6038887cd3daa.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/2a66617b84c9.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/ukulele_barre_chord_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_601fcf3d92fa1.pdfIn PDF document text
    • http://devuweza.scienceontheweb.net/wumosorijuwowavusaw.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/fujupovoxugolobufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/add_a_call_to_action_button_on_facebook_post.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/juegos_de_friv_hombre_araa.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/67909403910.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/b._o._d_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/value_menu_el_pollo_loco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e016da1-e9ee-4e78-bfab-680590d6bf62/have_a_peaceful_day_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07a5430-8705-4110-8f0c-3fc6450cad11/breitling_aerospace_avantage_e79362.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/gewijusumosoforufu.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/27288617883.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/percy_jackson_3_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/manuale_cronotermostato_bticino_l4449.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 5144 bytes
SHA-256: d35a127a310e804dd0238141b2c8247c3390cefc58f8f6ad4f103dc20d9859bf
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 10900 bytes
SHA-256: 8ee1188b71885f4ba5bc9656737cea5b1f41e8e2c07b80c1bdfeebd3bb837826