Malicious PDF — malware analysis report

Static analysis result for SHA-256 950f4ae320397eb7…

MALICIOUS

PDF

73.2 KB Created: 2021-03-21 08:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2fd792ddb817e29ac365d26b39d15101 SHA-1: a9f4d9f33f458ffa3c6ee734f51b8a196dfb2931 SHA-256: 950f4ae320397eb770bb37711ee975e35fdd4b20e271e9e8c55dcea2998efb6f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and the document's structure suggest it functions as a link farm, attempting to redirect users to potentially malicious websites. The presence of external URIs and the 'disposable hosting' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/award?keyword=cirrhosis+guidelines+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472775/normal_60328e11639b8.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/bigipudesikebugezizo.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/cultural_impact_of_globalization.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/womobim.pdfIn PDF document text
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/c1293e1100e3c.pdfIn PDF document text
    • http://xipukob.22web.org/35589306453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_5fd90816e7849.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ff6b9b0afdf2.pdfIn PDF document text
    • http://ranixug.iblogger.org/lujezavorufudekup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fe1d1ff23da7.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/femevowesusoju.pdfIn PDF document text
    • http://sereluxulu.iblogger.org/turorenavidevawafubufito.pdfIn PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/vupovevinajiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/45118636011.pdfIn PDF document text
    • http://zibelasavu.atwebpages.com/robinson_crusoe_malayalam_book.pdfIn PDF document text
    • http://sixijoras.epizy.com/illinois_llc_annual_report_renewal.pdfIn PDF document text
    • http://dixediw.epizy.com/82341835752.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_70ba793369524a12b08ad88d2e58166c.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_fc345b8be715411cb64a2e480a67569e.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_30a2ed09ebe64545bfe0b1806bec04c3.pdf?index=trueIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_81a750c73ca945d29092941bde9dc886.pdf?index=trueIn PDF document text
    • http://givorajosi.rf.gd/astral_pvc_pipe_fittings_catalogue.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_34c379fec6cf45afa58abd837d6b2f8a.pdf?index=trueIn PDF document text
    • http://zaxukesaludu.epizy.com/auditory_discrimination.pdfIn PDF document text
    • https://medlineplus.gov/cirrhosis.htmlIn 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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 5272 bytes
SHA-256: 275bdd4c82d6753209f92cd0cb90443dac239b6b39d3859b685d4ed3a4b6d929
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10740 bytes
SHA-256: ce0a70ab4527f70270edbf13be8fd5ce1d8ae43087fa5a109ba7d1220d09c092

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