Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f11c41522ac351…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 22:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 099d9098a30ba013e51aff2b12f87b44 SHA-1: d94a0bb9d490bd7b0549813a47d03fcfa8f4a25b SHA-256: 90f11c41522ac351062f0012a9c956b4a0f8f7656d285d315001697a1a3f455f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one primary malicious URL pointing to 'mezovuduw.ru'. This suggests the document is designed to redirect users to potentially malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

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://mezovuduw.ru/aws?utm_term=why+is+my+creepy+crawly+not+moving PDF link annotation
    • https://cdn.sqhk.co/felibepudu/ja0UcYW/tipo_de_anemia_falciforme_ss.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/fhfiiha/87468274027.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/Bgdjaje/pajokunadutukibem.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/Yqghcub/losiwulogopawu.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/guxosa/nitro_word_to_excel_converter.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_e7239b33a97642d2a239b63c068b2c9f.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_8d67d80ada724ff6a77dc6c36286098c.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_fa6feec0066a47f9861d79f7b98d35f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5cf0b1-29d3-4553-83d2-30f4ef8d3ab2/71191307071.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/unhide_worksheet_in_excel_with_password.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/rakiw.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/proper_squat_form_without_weights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84063ec8-b162-4886-a619-3bcc4bdf613c/93147657900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361ecfdb-a5d4-4da6-bd54-ee0b6ccc97be/the_importance_of_being_earnest_movie_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c9054b-c98f-4d40-98c5-b0ace164640a/32626178597.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/safari_safari_game.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_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 5616 bytes
SHA-256: 5152f7b8003d60a6bcedd5da1c740e618daabc729a367dcb119c6227d485b334
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 10644 bytes
SHA-256: 5ce05859276b85cc51d13db6e2e2c5f56c8fd44b7dd8afb8d626b809c1106a6c

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