Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c2e4e3d02152a5…

MALICIOUS

PDF

74.6 KB Created: 2021-06-12 11:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de9ec44b591acfde86ffe4dd221a0b86 SHA-1: a9d563f18306fd2d5b02c8b686d45861309d0dfc SHA-256: a8c2e4e3d02152a5514b13fd867285f9019ec6ca43bbf143345cd1817c500ba1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or content distribution network for malicious content. The primary URL, 'https://coretry.ru/pbw?utm_term=how+do+u+connect+alexa+to+your+phone', is presented as a search result, indicating a social engineering lure. ClamAV and ML classifiers strongly indicate maliciousness, consistent with a phishing or malware distribution campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=how+do+u+connect+alexa+to+your+phone
    • https://cdn-cms.f-static.net/uploads/4471945/normal_604d053d1ac55.pdf
    • https://nonufovoda.weebly.com/uploads/1/3/0/7/130775853/5438748.pdf
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/3979137.pdf
    • https://static.s123-cdn-static.com/uploads/4501028/normal_5fe3de466dfe0.pdf
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/kemenaxedi.pdf
    • https://cdn-cms.f-static.net/uploads/4420434/normal_60430b6215f97.pdf
    • https://vixoketos.weebly.com/uploads/1/3/1/4/131453026/gelezoki.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6068926a52b05.pdf
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/9536557.pdf
    • https://tegikalom.weebly.com/uploads/1/3/0/8/130874380/bevilapoxamila_jutasatijap_sasaju_teralodexoz.pdf
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ff653466bc54.pdf
    • https://static.s123-cdn-static.com/uploads/4412780/normal_5feb989b4f808.pdf
    • https://cdn-cms.f-static.net/uploads/4477651/normal_5fda3867c8acb.pdf
    • https://cdn-cms.f-static.net/uploads/4403560/normal_601681f9b0719.pdf
    • https://cdn-cms.f-static.net/uploads/4463006/normal_604a9ecc13de4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rorazokazog.pbworks.com/w/file/fetch/144731220/quadrilaterals_worksheet_grade_4.pdf
    • http://tarogifere.pbworks.com/f/14170521155.pdf
    • http://nowefuro.pbworks.com/f/materi_manasik_umrah.pdf
    • https://uploads.strikinglycdn.com/files/705b0635-735b-4158-b928-077b2f706933/27522292383.pdf
    • https://uploads.strikinglycdn.com/files/b6e3666c-8c36-48e8-ae97-7893547d61a5/95266663760.pdf
    • https://uploads.strikinglycdn.com/files/2cbb6b6d-1978-42db-b4de-c5cf9695ae39/used_tesla_model_3_for_sale_in_las_vegas.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f9.bin
56d6cb986c23f790e9993e0a089d2fb6f7ae017ef17511d108424dcfb994c61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5208 bytes
font_01_sfnt_off0000f8bf.bin
90a905b641e3566d249eafabc9f9419c33b05762a254de15edf260a3b2598264		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 10768 bytes

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