Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5141eaeac282ffc…

MALICIOUS

PDF

79.2 KB Created: 2020-11-23 16:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 55afff1a0085ca37c398e8007c779883 SHA-1: d338e19912dde0f12f53a43f2efd99a4161c7b07 SHA-256: f5141eaeac282ffce101ac1348df7658131327d8f134ec32ed39bcf329bf3565
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. The document body, though heavily obfuscated, contains text related to 'chess titans online unblocked' and authoring application details, suggesting a lure. The presence of numerous external PDF links, including one pointing to known malicious infrastructure, strongly indicates an attempt to redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=chess+titans+online+unblocked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5f8996027da4f.pdfIn PDF document text
    • https://kofukupapakube.weebly.com/uploads/1/3/4/5/134586312/9143821.pdfIn PDF document text
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/zabota-dadosam-kegajajala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5faed86244c4e.pdfIn PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/4626998.pdfIn PDF document text
    • https://vawavujak.weebly.com/uploads/1/3/4/3/134350312/wigudir.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/249c4.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
    • https://s3.amazonaws.com/jajuzasalikirut/pediatric_status_epilepticus_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/basomebepezekajek.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/45852474226.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/how_many_suqah_inhabit_lunar_isle.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 5040 bytes
SHA-256: aa2dc6827a7ed84e07480ae67583a71589373f05b64fbcc30c46243a5a4941c9
font_01_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 1596 bytes
SHA-256: be440fd795d879ec6b2b259df0a9e0ceb9ca10e3dcd43f5ec0c675d6f5775512
font_02_sfnt_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 11740 bytes
SHA-256: 8c29a2a6c167a1c7cd00a5198e463cab64dcbe649fe2866f441ca73cc5c935b4
font_03_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 16060 bytes
SHA-256: e0011ec37e8d90a5f7ef53faadbdc23bd163c5f5f8be9ca735efcacfd1894aff
font_04_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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