Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e61befaf143238…

MALICIOUS

PDF

69.1 KB Created: 2020-11-23 21:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c54b33832712ad8cf1bf24bf74c77046 SHA-1: 16e6a824ad8f4691bf8134df8985ad8a32363aad SHA-256: 26e61befaf143238769e0dab67f5d68c2639f42f9b73ece92414820b7d675085
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=nintendo+ds+action+replay+not+working In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5f988cd77b803.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/1289421.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/batiku/69611048255.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/can_do_descriptors_3-5.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/fibojidem.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/video_er_reddit_firefox.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/pattern_for_kitchen_mixer_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/xubojelaxalanog.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_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 5468 bytes
SHA-256: 2836f00fa0783eed88a36886face248dd5ffb0452b1d5c932d4257f7793aa352
font_01_sfnt_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 10592 bytes
SHA-256: e93791d60a40e7706e11d5eefc2053de7fa8fd609fb923b12302355f2edc699e