Malicious PDF — malware analysis report

Static analysis result for SHA-256 989a5cfb32e57989…

MALICIOUS

PDF

67.1 KB Created: 2020-12-01 20:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b2c46d4b6b7624b33fb887bbc303f027 SHA-1: ed1bf6f8f1cc14ca9be1c3d93e6b898cbaee6e47 SHA-256: 989a5cfb32e579890d9e5078b29c61a9a95a38347ce7293f4779f215af4d4803
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm, directing users to potentially malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

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://gettraff.ru/123?utm_term=constitution+quizlet+definition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5faa0c7d1077d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f97885e18ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5fbf8a66e9a51.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/4224488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5f99a63262d47.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/520d4940-e7ea-4d2c-9477-092796642b68/41860264516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca89d83f-5d97-4a7d-be6a-ca73bf9729ed/national_jewish_book_award_winners_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143109fb-f653-4ce1-8561-e93e733affb5/pawuvurakifovawigozakemeb.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0672f60f2895dc1e54ab2/t/5fc2e6b408845d0924e9ffae/1606608565905/xujokokexokolibetuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d46de4-7b17-4d20-9111-d99c87d2c38f/xupimorifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbc4b3f-c9f0-4c5d-8f7e-27b88606a9bf/ancient_greece_map_quiz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc35e67cd1e280355e3f728/t/5fc63f973c02f22b9de14af1/1606827927936/mibasozusetamugerad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1effddc-22d1-4a18-bab5-3672ce42f98f/5174745543.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_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 4676 bytes
SHA-256: aa4e574647297f9338953e085b20417a3cf7a9baf2aa3990352ce67e2d69cd3f
font_01_sfnt_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 9976 bytes
SHA-256: 45bde3264d76c9b3ecc13c6514d5c54f90c92e08a8130211ae06f663ccd83e07

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