Malicious PDF — malware analysis report

Static analysis result for SHA-256 741fbca571e9ed5e…

MALICIOUS

PDF

69.8 KB Created: 2020-11-17 22:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 73893840631166c6c0a55b3b9a61ce90 SHA-1: 29182756c2839a299a2b03d6cafb45907be3bbb6 SHA-256: 741fbca571e9ed5e876f5dce637f5c09ff6b1ec076f4c98b2a786da4e3ec4dd4
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. The primary link directs to a known malicious redirector, suggesting an attempt to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • 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://traffmen.ru/123?utm_term=ios+animations+by+tutorials+5th+edition+pdf In PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/8346337.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/lekudonakupirerixize.pdfIn PDF document text
    • https://selubigal.weebly.com/uploads/1/3/4/5/134518702/e20544fd4c6b1.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/b034c.pdfIn PDF document text
    • https://gizukazirup.weebly.com/uploads/1/3/4/4/134443136/1e69024f9c7a.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/0a328aa6-6961-40b3-b454-e9ef5476b639/vubejitoxux.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/apache_license_version_2._0.pdfIn PDF document text
    • https://s3.amazonaws.com/pojojagajevuxa/pascal_s_triangle_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e1a6b8-61c3-484a-881c-087321a96e62/rututomimarode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04066e32-f3c9-46ad-99b5-632ea83e12ce/91640262555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aaafe50-df43-4508-a28a-3fa24518a20b/vopovexipapogudisugawam.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/alfabeto_japones.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/strike_force_kitty_3_hacked_arcadeprehacks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8a916b-747d-414e-aa16-85354a56b1b9/99548645270.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/free_android_root_app.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_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 5584 bytes
SHA-256: 0591bb84c87dc67df242edb8c6c45bdaae627706dff71508e2ebf2caed67f8f1
font_01_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 12584 bytes
SHA-256: d7705bb83335bc3b7523140a7ecc5a2c8526413853c36ce27e27f6f9b6123622

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