Malicious PDF — malware analysis report

Static analysis result for SHA-256 1772f3a6a54e8ffb…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 22:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34871b6c56eba4909b33c7ef641228c0 SHA-1: 266ee618a72f8cf9cd3121905dca8ff4d18d57b6 SHA-256: 1772f3a6a54e8ffb09b5c0d4ff0a6f51eb0d7ae5c3806a8a4ca5d46e80a1953b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to seemingly benign documents, but one prominent link to 'midufefew.ru' is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the suspicious URL. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=single+event+probability+worksheet
    • https://cdn-cms.f-static.net/uploads/4459791/normal_604494228193e.pdf
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/3f65dec9dac.pdf
    • https://cdn-cms.f-static.net/uploads/4405420/normal_600fd555654e1.pdf
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/pegebetililevew.pdf
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/4867137.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/defipedibe/case_files_surgery_5th_edition_free.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/how_to_make_a_logo_vector_format.pdf
    • https://s3.amazonaws.com/xupizewuxere/wofupavofa.pdf
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_91cbce25b2df423584ba5da9404a9c31.pdf?index=true
    • https://s3.amazonaws.com/widofafane/sumovuwowi.pdf
    • https://s3.amazonaws.com/kawotexulozax/carer_allowance_form_over_16.pdf
    • https://s3.amazonaws.com/tulosa/70893093620.pdf
    • https://s3.amazonaws.com/dazawojob/pearson_biology_11_textbook_answers.pdf
    • https://s3.amazonaws.com/pafiganovavi/41589459867.pdf
    • https://s3.amazonaws.com/mefonevimimix/palan.pdf
    • https://s3.amazonaws.com/wixanarer/tededawegexoluz.pdf
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_6aaf75c97f0f4c60a2f05ac688dedeab.pdf?index=true
    • https://s3.amazonaws.com/levovod/85182842145.pdf
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_ec57095fbb67472c919f18b8ccfe548b.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_d00f5fd9bf554c46ba3d66de389cd481.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27a.bin
dc0e5b4006be8dbed2cc649bd2142ae1cec32f024d3b0d6d7f589032fdecbe96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 1624 bytes
font_01_sfnt_off0000ea9f.bin
b0dfa040a4eb2c17a3317fdb00b8978461521a13f72c8a6ccb6158dee10f38b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5644 bytes
font_02_sfnt_off0000fde8.bin
1b3e9c72675ca804754d95829a16f5776162434f88e47397d090c8a2cf4d915d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10852 bytes

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