Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7b57738753df6b…

MALICIOUS

PDF

100.6 KB Created: 2020-12-29 12:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 670301fdf52b086cf0cab8bdf2281241 SHA-1: 77d8103e8691a603935ff2c0e8474b555f7217ed SHA-256: ce7b57738753df6bb8d441a5fb0401602afc70daf2b8ebb0b24dc83528aadda5
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One of the initial links directs to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a coordinated effort to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/strik?utm_term=catenaccio+football+manager In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5fd341d03418b.pdfIn PDF document text
    • https://wabewubo.weebly.com/uploads/1/3/4/6/134670528/belivifo_misafevuzobis_kerowu.pdfIn PDF document text
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/galubilosojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5fccb84a0c834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_5faaede16c481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fd67b344cc66.pdfIn PDF document text
    • https://runogobikekeg.weebly.com/uploads/1/3/5/3/135350887/rajebafonogen-jufavazezosix.pdfIn PDF document text
    • https://vazujupipizake.weebly.com/uploads/1/3/4/7/134719511/tategadedik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5faaaf8a4360d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5fe91dfc63cef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498883/normal_5fb973cbbb64c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_5fb41922caa4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB1 4976 bytes
SHA-256: 3efda71502bf54f21854b6ea7d29c9bf6e8c8e1f0739e95cb0922321b7a12045
font_01_sfnt_off00014f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F82 12592 bytes
SHA-256: 137870a4ef889681a025242f54ede7e332bf612ffaafcd7b05d0fddfa113be0f
font_02_sfnt_off00017746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17746 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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