Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f365a20a783faf…

MALICIOUS

PDF

87.6 KB Created: 2021-05-27 06:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3c13dd978c529127f39347a667d36b6a SHA-1: 23022dccc6197ef426b8920d634ca73bf004c783 SHA-256: c5f365a20a783fafa05af4130a3b023cf29cd8ff69727b6cc39e4909facd50a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=dragon+ball+z+tenkaichi+tag+team+mod+download+for+ppsspp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412891/normal_603a6817d7ac7.pdfIn PDF document text
    • https://xiduxerajul.weebly.com/uploads/1/3/4/6/134696605/6014840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_60192c45b319f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5fc6482327866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471234/normal_5ff3bbb5ead32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_601928d9e607f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_600c7ba18a4d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_602d754e100f4.pdfIn PDF document text
    • https://sonojija.weebly.com/uploads/1/3/4/7/134723635/1a6bd6b10f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408348/normal_6006b47755531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fccb95911e69.pdfIn PDF document text
    • https://jegesasep.weebly.com/uploads/1/3/4/5/134502647/dc5137b024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_6068f98c2d7df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_6038cd55bfcc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_6027b0d4311d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_60345cc5caa9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b2df9c-cf4e-48dd-8099-151b8fdf59ad/sendetermine_fifty_shades_of_grey_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17566f00-70f0-419c-9ed7-75370d9f9862/78873046036.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 4060 bytes
SHA-256: e332a95c0ca732ac3ad49a5344b95acd26e555177db72ee0ed2f76820df6fecb
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 5912 bytes
SHA-256: 3527eb1a1abb035170a3703419bc90d5621135851252f207ad7e36f244bfcd51
font_02_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10892 bytes
SHA-256: 43f67bcc1a38a26629607d1def7e70153156935b998c5ac1523a036de4111b7e
font_03_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 17164 bytes
SHA-256: fe73cd2dfa5b1fdf1759284fae2fb14ed1a59b9009a8f23b8f6a2116ad7db6b2

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