Malicious PDF — malware analysis report

Static analysis result for SHA-256 c013582453b0ee5a…

MALICIOUS

PDF

83.5 KB Created: 2021-03-03 19:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cbdd20a878b053b97c522e03e7f11483 SHA-1: c31bc0a90b1ec3319780036e1512d50f7e6afebc SHA-256: c013582453b0ee5a1fd159c278d8e255d3aba69c6198b9b4b73f2bff22119327
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO spamming tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=what+does+god+say+about+adultery PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418764/normal_5ff266305411d.pdfIn PDF document text
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/7731198.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/dixeritifuxunuziwigafefep.pdfIn PDF document text
    • http://sqrab.top/tixubemovexoderimepipu29wf.pdfIn PDF document text
    • http://shoop-fg.ru/jakapaveledotolidawm8sd.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/dmv._ca._gov_real_id_formlbv2d.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/signos_y_sintomas_de_enfermedades_del_sistema_endocrino.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/98604999782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fece64bd11ea.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/somisilegex/bstc2019_org_bstcform2019_vcnt.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/invitation_letter_template_for_uk_tourist_visa.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/the_raven_remastered_review_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/harmony_home_hub_review.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/android_one_android_pie_update.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/13754099535.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/kelibef.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/fulizorokekiwefu.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/bts_new_album_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/27412095335.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_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 5340 bytes
SHA-256: 0b99e5a4d484eb8233f8dba6b8f78b0f5ed6f60d7a61d6e80dbe3e871c2a0dc4
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 10408 bytes
SHA-256: fddcb9b887352aa78a93ba3172fcc36dd7f6e4fb6fdd779c60cfef65d799ac71

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