Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2af8f7240e59e42…

MALICIOUS

PDF

65.3 KB Created: 2021-03-03 19:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30c05becb6a0d3e9c17c0afd76b402d8 SHA-1: 31d91d94633c9f7cda20145dbcee8494ed021a90 SHA-256: d2af8f7240e59e42ca1df42944f031d0ef5276b6e666b0f8f94b4d287efbc51d
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, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially harmful content.

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://zajinet.ru/award?keyword=mecanica+vectorial+para+ingenieros+hibbeler+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449187/normal_6009910a7c93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fd3482d63208.pdfIn PDF document text
    • http://tk-time.site/781050422276zwmk.pdfIn PDF document text
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/9336620.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/2ea4d908.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/1d8401ea1e.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/musokejixami/dance_monkey_tones_and_i_free.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/divexobexotijotuximajo.pdfIn PDF document text
    • http://mefetapa.rf.gd/planting_and_harvesting_beetroot.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/embroidery_digitizing_software_free_full.pdfIn PDF document text
    • http://nonakiwobituk.rf.gd/moving_images_for_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/kbc_gbjj_question_answer.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_off0000c0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 5624 bytes
SHA-256: 8a4b01bce22f0e14fc61a07b654fc726e3b51ba895e523cf809ad56ddac79df4
font_01_sfnt_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 10760 bytes
SHA-256: 67f65fa7a935b55952d742a23f61c48575354bfaf3d84bf2c1f312e39c0aed8b

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