Malicious PDF — malware analysis report

Static analysis result for SHA-256 949fb56f29003981…

MALICIOUS

PDF

130.7 KB Created: 2021-02-15 07:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 112113d9fa8409d0aa97dd7910d37d1b SHA-1: c762e192feef3e270f5fc7e791351a31d53e1d11 SHA-256: 949fb56f290039818b993c33b68bda17a934fe35f7c5c0713cf3e1075b1a5667
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious sites, likely for phishing or malware distribution.

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://druttle.ru/wb?keyword=about%20verb%20forms PDF link annotation
    • https://poduxerot.weebly.com/uploads/1/3/0/7/130776630/safovewop-kabevasox-nijetimex.pdfIn PDF document text
    • http://solavopuna.22web.org/manpower_resource_planning_template.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/OgfihkF/leap_of_faith_quotes.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/musadojibod.pdfIn PDF document text
    • https://nobenore.weebly.com/uploads/1/3/2/6/132696051/3554184.pdfIn PDF document text
    • http://bopepon.22web.org/frosty_the_snowman_piano_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5fce4d65d85eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_5fda21740c12d.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/kukazowox/closing_file_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/79909948972.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/kirixonajomebukowibejewas.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/xulolidasakife.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/german_pronunciation_guide.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_off0001c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C706 4860 bytes
SHA-256: c59977a7a5d1b14655531ce601c480b60c7a48f375b8b5ec0940ae2e386e4a14
font_01_sfnt_off0001d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D783 11212 bytes
SHA-256: a4736c9d3ea44602a0dbf4b01dd57f48b1b9370983dea28db88b78b641b1a987

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