Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca751650f4d7a75…

MALICIOUS

PDF

70.3 KB Created: 2020-11-20 12:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 14d363ad60e90bc8fb702b6993745801 SHA-1: 15a95c0a3547712ed69414baec7da028f013bd7a SHA-256: 4ca751650f4d7a758a6ee97787a551a011c518b2a7898a1466e20b4942b83ebf
222 Risk Score

Malware Insights

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

This PDF document contains a link farm and a specific malicious redirector URL, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to software activation. The presence of numerous external PDF links, including one to a known malicious redirector, strongly suggests the intent is to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=clave+para+activar+corel+draw+x6+gra In PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_5faeb1dee3b8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5fb28f7128625.pdfIn PDF document text
    • https://wajevuwefabebos.weebly.com/uploads/1/3/4/6/134681626/dezumazaga_tefipop_tepowuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f92a242cb99e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_5f988bb6b118c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_5f9669358fcb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fb4b097c2b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_5fb5183f4953d.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/0a95400d-b079-4704-8340-a5b663b18051/nutasozig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73c12bb-7050-446f-82ad-733c12e474f6/bikawusuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/67492626868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f2b4ef8-5229-4c07-87db-527b57cc18e2/87966184367.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/movie_hd_apk_for_kindle_fire.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_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 5344 bytes
SHA-256: 8c8199387225ad49973baddcf406f3a96239faf21d9ff30b64a274d9f679e702
font_01_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 15976 bytes
SHA-256: 63f7ea6c4246e27852ba3020cda155cf0ab9b16c0db60820fb0bcfa06f279a77

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