Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c333d467e178bac…

MALICIOUS

PDF

76.5 KB Created: 2020-12-04 03:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 090edd10e15e6d2858d98985b36c4add SHA-1: 2fc3c41e30e6f53c9091ef172d80ee870de97d75 SHA-256: 0c333d467e178bac5509adc6962a3269789fc7bbb6d0c01ebc6e49db301bab00
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it uses an invoice lure to trick users into clicking a link, which impersonates American Express to steal credentials. The embedded URLs point to redirectors and potentially malicious PDF files hosted on services like Weebly, suggesting a credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://feleluxotikuko.weebly.com/uploads/1/3/4/3/134338959/zijifulowoj-subep-xezoruwo.pdf.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafficel.ru/strik?utm_term=accounting+chapter+5+answers PDF link annotation
    • https://feleluxotikuko.weebly.com/uploads/1/3/4/3/134338959/zijifulowoj-subep-xezoruwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5fbe3bb3480bf.pdfIn PDF document text
    • https://tusunupo.weebly.com/uploads/1/3/4/5/134507020/1e5a17b9.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/2622389.pdfIn PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/edca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_5fbd507b6756d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfdb415687f52b6b7b2913/t/5fc1a829f3de5e49b5a2e1d3/1606527018173/19612353025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97edcdcf-3928-478d-ba7b-a193adf9ffde/air_compressor_lowes_kobalt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a459d79364840843980/1606371909454/four_texts_on_socrates.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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 5368 bytes
SHA-256: 8e818f242a7afff9a57fc426a6261081a9605200fe0dd2308695b7e449dbff17
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 10956 bytes
SHA-256: ab25d5fcb16c5629c8b6b8773df01edd44ccbb1c426b8fb1b745a884d6e1d188

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