Malicious PDF — malware analysis report

Static analysis result for SHA-256 637c678a76040da5…

MALICIOUS

PDF

69.2 KB Created: 2020-11-21 00:27:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1d17ee508f281501554fe513fc466dd8 SHA-1: e21b000520265bee86d1dca301259dc0016b45f3 SHA-256: 637c678a76040da51b572b09bc8cb0d58c166b586bc4c735fc80161eff445cb7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous external links, with a critical heuristic indicating a link farm. One of the primary external URIs, 'https://trafftec.ru/123?utm_term=thanos+titan+consumed+pdf+espa%25C3%25B1ol', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=thanos+titan+consumed+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469128/normal_5fb753c38059a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5f9a7ecc1b944.pdfIn PDF document text
    • https://wabemogulumog.weebly.com/uploads/1/3/4/3/134384503/340f2048b086e.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/jolituzoji/43523257371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18239f60-215f-400d-a057-4996189b1696/wafaberojujat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47d2e13-8148-4baf-98ed-d8cbfd58bd25/78493054974.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/www._bsf._nic._in_recruitment_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1dd3a2-fcb5-4a49-8a04-7fddf12d0a12/nabukodazezubuwobilider.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e46736-d76e-400e-a7f1-f76d99a6a564/16106961597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3255dce3-0647-43b1-aed0-909b8ee671e8/56103238589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6913f475-a7b5-4675-9cc2-d179a84d11bd/darkness_at_noon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edad169b-6a2a-4515-9d7d-aea36dfa888d/parobotonaxexapolizatifuz.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/fubemebatamuwuluvatatozu.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_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 5460 bytes
SHA-256: 8e2eae4591c87631ff0c3a37d79ab3b3d620ac67e240a949fb3bb333620b3b4c
font_01_sfnt_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 10220 bytes
SHA-256: 7bd63f764abffcce8cbd7404ea160906aff5a92c292e912893e38b5ac483a128

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