Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0525175ba99f4db…

MALICIOUS

PDF

72.4 KB Created: 2021-03-09 05:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1ac54eca08c6f7ed46ec885b52913cc5 SHA-1: b982fdf4d8e50976382eadf3d5e3111d509e5a17 SHA-256: b0525175ba99f4dbb6b4de015608882d2e54f1118a2af28c974ed9863efe4060
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO abuse for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary URL likely serving as a lure for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=ap+human+geography+chapter+8+test+answer+key PDF link annotation
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/dunoxanin_xowuko.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/vomun.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/lajemula.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/papafuxozew-panolewinoxuja-morol-fezeru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5fdf3bdaa24a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420760/normal_5fc9abe30c0a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_60425eadc0c7d.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/pegurenovowuwerumir.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/kuratadixoti_tuxokolovanevo.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/07d0fb4b3315.pdfIn PDF document text
    • https://numuteje.weebly.com/uploads/1/3/4/6/134683694/muzife-guxizig-tibafegew.pdfIn PDF document text
    • https://zulozuger.weebly.com/uploads/1/3/5/3/135310252/rotani_jakegoneboxak_zelepaletonuf.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/gixirojozogufux/chloroform_is_polar_or_nonpolar.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/40733100225.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/safifuxo.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_33deabc4e70548dabc795f96d551f195.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/pozurutofufirunavuniwij.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/zaxusowurajomuf.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/avery_business_card_template_blank.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_384ed2fef7da4d8d8f5bda0a2c308a19.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_bc2318e63d4743febebdff4f9df679f2.pdf?index=trueIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_25e8b3bb64574e50862f6f67278baaf2.pdf?index=trueIn 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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 5756 bytes
SHA-256: 0eff0c1063ee28fe70eda81187bee4dd287e5f195decbd57d77f197d74c197b9
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 10408 bytes
SHA-256: 0a159699f5b458aa4c7326ee2696e5ad1b600f9bbf97055a237649a6deef478c

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