Malicious PDF — malware analysis report

Static analysis result for SHA-256 6375c2b7cf965ca3…

MALICIOUS

PDF

63.0 KB Created: 2020-12-23 01:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3d99832cfc98a662dfa829e607025560 SHA-1: 7a037b94f967cf549e59b44d180e244fc5823ce5 SHA-256: 6375c2b7cf965ca31b332d855bfb227945650a04b7aa8abf5d15841e68fa77a7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with many pointing to disposable hosting and redirector infrastructure. This pattern is indicative of a phishing or spam campaign designed to lead users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?utm_term=burnham+alpine+105 In PDF document text
    • https://fixumimudojuzu.weebly.com/uploads/1/3/4/6/134607797/7507171.pdfIn PDF document text
    • https://vejefoxebeses.weebly.com/uploads/1/3/4/8/134860837/delufisuvumeki_tawowopowix_noxuzoromipa_kopelaju.pdfIn PDF document text
    • https://tewijudejasivi.weebly.com/uploads/1/3/2/6/132682467/a4d5beca813bd.pdfIn PDF document text
    • https://jagobedumaniso.weebly.com/uploads/1/3/0/8/130873939/dopudojofojuxijaj.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/2fe70082333acc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5fcef8bd2325b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8817a46b3eb.pdfIn PDF document text
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/5312872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc55adea13a450bab12175e/t/5fc75f7e0623334b0c5f5149/1606901630660/zivufasojopizotiledi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5368b116eb00e3c682b4c/t/5fd0320826d54b3c06ca5a02/1607479819925/nupiwepezonamu.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/lefimitezizafanewipat.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/dugelumuxof.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_off0000b8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F1 5248 bytes
SHA-256: 4a7908789b7e9373408a04b7f6c3558f1bbe7ddde5d787813e805b881857741a
font_01_sfnt_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 10760 bytes
SHA-256: f4006d2a519abd670adb3c55ff33a1b6144ec0d233bd38b6ba138e312fb06b65

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