Malicious PDF — malware analysis report

Static analysis result for SHA-256 052be908f2da0745…

MALICIOUS

PDF

102.3 KB Created: 2021-04-04 03:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ca4635d3a2fb10f9afbb98e0c092cc0f SHA-1: d91fa9ffca3535ac06392d5985b3239f1650c759 SHA-256: 052be908f2da0745284e327b2731e3d42acd293dea8d7f1cbeaa81ce760114f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized document. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. Numerous embedded URLs point to disposable hosting, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/award?keyword=boolean+algebra+worksheet+pdf PDF link annotation
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/d5105.pdfIn PDF document text
    • http://kalanuso.iblogger.org/28497587002.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/8523188.pdfIn PDF document text
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/1828688.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/nafulizozokozewetuj.pdfIn PDF document text
    • http://kirunag.66ghz.com/15876446245.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/juzimiwoturone.pdfIn PDF document text
    • http://berilunowalaz.iblogger.org/11847087128.pdfIn PDF document text
    • http://fibaratibe.22web.org/sefatarizanixet.pdfIn PDF document text
    • http://ferobuxanax.iblogger.org/alkaloid_extraction_methods.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_aea7f67724434b1c8fd5ba4f5fcd1c0a.pdf?index=trueIn PDF document text
    • http://xepujeroniwazip.epizy.com/bumibiroresajureman.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/bikokuduvozufulo.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/tovetojoxo.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_8f14bf46ec3e47258c85785ceda3ee2d.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_2c50efd0f72e49089b632b5ad5ed2acf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/75073008855.pdfIn PDF document text
    • http://dibesenowox.epizy.com/sojisone.pdfIn PDF document text
    • http://dimonejoxu.rf.gd/jsw_roofing_sheet_dealers_in_kolkata.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_ab22beb2734340b49f065923a039d9f7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6F 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off0001556a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556A 5648 bytes
SHA-256: f46140247744b349114294aac11fe3e3c6c74b44fc2bc9b601fdeb4643380bc6
font_02_sfnt_off000168aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AA 10304 bytes
SHA-256: 7f6ffc4702352b0e23f8b11e8ec0b5f5b9aaaf30f89e8c0508385a8d799db2f1

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