Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37e0d35494fee37…

MALICIOUS

PDF

67.5 KB Created: 2020-11-13 22:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 774035fecc7158c4db3ed6ed2b246344 SHA-1: 9ea46dfa66201e763f29213cd36bf8fe0475a65b SHA-256: c37e0d35494fee3708a6676b79bcbbd4778834721b26b22b0d366d473615a723
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL, https://cctraff.ru/123?utm_term=vietnam+war+quizlet+us+history, is the primary indicator of malicious intent. While no scripts were extracted, the PDF structure and the malicious URL suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=vietnam+war+quizlet+us+history In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5fa5f2054754c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_5fa30586debcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8785cf6532a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5f95489b30d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5f9da3a60db7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5f9d9c2bc7b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5fa7859a5bfe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f97d12ca9bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f88b1a2ce798.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bojafazes/need_for_second_green_revolution_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/84069957681.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/57005690425.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/xenenagewu.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_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 5260 bytes
SHA-256: df4329d3e1171782c7f63538c38517222e32f8ac29ee1f3236f4d58a106cce1e
font_01_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 10308 bytes
SHA-256: f59fd534791512dcc80c0259a33aa72a673a4fcad9f1d764dd753aba763cb021

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