Malicious PDF — malware analysis report

Static analysis result for SHA-256 689d239e61e6d971…

MALICIOUS

PDF

62.8 KB Created: 2020-12-17 02:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e4ad9850a735fe50949936f75419debf SHA-1: 0cdf65101c2faded85f930cd706dbb03a3eb3c22 SHA-256: 689d239e61e6d971177cc0594e462eea551901fa24429d9dd5a3df58b149f72f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly legitimate-looking PDFs.

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=heatblast+ben+10+coloring+pages In PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/vogodawa_pesol_rozoxonanukoz_kikizeruzukit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5fca6c43e14bd.pdfIn PDF document text
    • https://resumaseba.weebly.com/uploads/1/3/4/3/134318739/c2717f.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.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/a03df806-c942-45a9-a8f7-7375e8b5cab0/sesexedimuvirakupeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca740d2-296d-46d3-9a2c-7e6e99e0c02a/nugigaxaporipivupomekix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a81efb2-45f8-44bb-afc9-e8906f4f2905/17596494886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d8b304-98df-4571-9c14-47ae31c1a990/recommendation_letter_template_for_teacher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6f189a-20bb-4412-9172-a2fc288ba5a5/16691127350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f375dc-0c79-4b45-9c2b-98353274d105/how_to_build_a_stencil_project.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/75105092840.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/romeo_and_juliet_act_2_answers_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b8ba61-5f0d-4069-8eb5-2a0ad03f6142/zufepibopewatibifokiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841b1c6e-9ccd-4474-b4b6-b5af85ccf761/cinema_hd_apk_for_android_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b899e24a-1d34-476d-b717-382bd5af8d77/38846439928.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_off0000ba00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA00 5396 bytes
SHA-256: de5cfae73bc24e2c0ad299cc60a3b0cb7a3c1fa8f0b52bc1b5985dccef91994e
font_01_sfnt_off0000cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 9780 bytes
SHA-256: 5d09a4b8415fc5a819e9d9629407ddd6eeda3e262c7643ee85d7de9a9e039fb5

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