Malicious PDF — malware analysis report

Static analysis result for SHA-256 6973b9b6f730d289…

MALICIOUS

PDF

79.3 KB Created: 2021-01-01 22:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b2ab1acbd7af4730ae816175532612ca SHA-1: 1416ebfc2fc99cb9a16ddcfa78e7c05f50e88693 SHA-256: 6973b9b6f730d2892ccd586206a8af2c36bea6d969bdc50ac4f9c16b574e4581
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://trafffi.ru/strik?utm_term=among+us+blank+name+generator', indicates a lure related to a popular game to drive traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely 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://trafffi.ru/strik?utm_term=among+us+blank+name+generator PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fe26d6017843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc8b32c2b153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f87169030f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_5fb2571b7fa10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5fc9d9753d904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_5faab8e41ca1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5fc870944ed7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f8df9fc17712.pdfIn PDF document text
    • https://rukiwopuxe.weebly.com/uploads/1/3/4/3/134340105/d529f5.pdfIn PDF document text
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/738e287cfa4a433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_5fbd5d593b4a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480749/normal_5fc59efa0319c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5fa57aef1d66f.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://uploads.strikinglycdn.com/files/f55f4b35-fc7c-482f-8560-ba3d816821e7/wefakive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e17d7c-4837-40c5-a5d0-50fd34a9c604/errorcode-4461_sqlstate42815_invalid_data_conversion.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 2892 bytes
SHA-256: b2f6842ece3a16682cb3359d21449b6e1870e9274665864897ff9a59440bcde9
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 5032 bytes
SHA-256: f5adb8f3f6cacd07728f8aeac803ddf65156bb77e1581dd1d52528f3f099b584
font_02_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 10516 bytes
SHA-256: 35930bec4d87647476050f4647f078303927447c2d308592f89a721067123b95
font_03_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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