Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcc5bf9ee4a7389…

MALICIOUS

PDF

71.0 KB Created: 2021-02-06 03:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2293bb7a52317db4fe45f6425612585e SHA-1: 138f1bede42ed1ab44874597006bb536083adc8c SHA-256: cfcc5bf9ee4a73898b12a797dfd6f84dceeb5c886cd823d5d7f85a4708a556fc
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'free movies sites telugu' and application metadata, likely serving as a lure.

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 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://seumenha.ru/wb?keyword=free%20movies%20%20sites%20telugu PDF link annotation
    • http://kirisixifikixon.22web.org/following_instructions_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6011f5863039b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_60140a44c6f3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_600b5360bf5e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_601dce41dd18c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_6010d2c059a13.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/7339063.pdfIn PDF document text
    • https://zosotise.weebly.com/uploads/1/3/5/3/135393527/bukibom.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/bibitarumiko-goxufuz-losadedagiw.pdfIn PDF document text
    • https://zelunetuba.weebly.com/uploads/1/3/1/1/131163782/554145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fed1451bafc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_601243fd9f23a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopiwutipav.epizy.com/telugu_emotional_whatsapp_status_video.pdfIn PDF document text
    • http://sijurajogo.epizy.com/zijan.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/logagasetotinedopuge.pdfIn PDF document text
    • http://wifobujaxude.epizy.com/13112339326.pdfIn PDF document text
    • http://xarugutivi.epizy.com/air_pollution_information.pdfIn PDF document text
    • http://zapuvem.epizy.com/62338924451.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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 4812 bytes
SHA-256: 2b04f822e87394e6dec57436a2ec71b90ff77d6d5b90658fcf0e8010d193f5a5
font_01_sfnt_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 10820 bytes
SHA-256: 1606896b8381636398c9a985ece2e72a496ba3055cd608dcb74d00bfea0c1ae6

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