Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83e69fba2cb0892…

MALICIOUS

PDF

68.4 KB Created: 2021-02-17 22:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 084c2773ff7c806a2c7adabf53002292 SHA-1: 81a8b6142564251512aeeaeaae8005d4e59513bf SHA-256: c83e69fba2cb08929e07c08fc59424cb3e15f24d0323f2326d8d438055671466
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://leonvi.ru/123?utm_term=arris+dcx3200+m PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fc830f82992e.pdfIn PDF document text
    • http://pakamid.22web.org/adaptive_defense_360.pdfIn PDF document text
    • http://menajaf.iblogger.org/28694611880.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/cWjhfE9/kuwizoxobobiwifipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_602d01cf2a4ee.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/3565225.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/8814360.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/gl7hauQ/39921644024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420586/normal_5fe40ff779e08.pdfIn PDF document text
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/xawebubevusaz.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/ngiEER0/dewizobelabobafekigemorof.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/wjjjagt/racing_3d_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sofejovizifufin.epizy.com/infant_baptism_catholic_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/ad_hoc_reporting_and_analysis_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/88214168416.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/file_analyzer_app.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/83425447201.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/kuzulebabebegot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 4712 bytes
SHA-256: 6e7550de7a2760cf5b0dc1232ae535ee8c3a641203e7e7900892306d7f2b3204
font_01_sfnt_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 10600 bytes
SHA-256: 3dac413564067237a66cf34755defa8f590ca29000a7a86599087577c2daa185
font_02_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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