Malicious PDF — malware analysis report

Static analysis result for SHA-256 12daac00d41237c3…

MALICIOUS

PDF

75.3 KB Created: 2020-11-23 14:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cab1b83c984d6eab896bfe2d92c73785 SHA-1: 192948bd7b201c829d58299171e50f76a64fe2c6 SHA-256: 12daac00d41237c3ee1a86e4209342d297c7705a156b0c0aa69292d6322a9509
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://trafffe.ru/strik?utm_term=masaaki+imai+aportaciones+a+la+calid', suggests a potential phishing or spam campaign. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the extensive linking pattern indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafffe.ru/strik?utm_term=masaaki+imai+aportaciones+a+la+calid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5f973c4bc2f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fb592c06fbb2.pdfIn PDF document text
    • https://tajedapen.weebly.com/uploads/1/3/4/3/134373213/zibides.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_5fb2cb3e90c27.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/manuzidokoju.pdfIn PDF document text
    • https://dewisepiremutu.weebly.com/uploads/1/3/4/3/134318599/9204750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f892203b2aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_5f9bbb267be4b.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/1eb0cd35-6833-43a5-a4fb-62b3d543681f/beligupaxejerav.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/kotuzepubiku.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 5288 bytes
SHA-256: 4365c15cb980c2462bb7cab10df1b8ff69e3753b274071e9073c6cfae512cec8
font_01_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 10668 bytes
SHA-256: a6c0d5dd5500051e346111b971c1f64182a711a8af0dd1dc06038f00ffbee67f