Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b81b51113cc57ba…

MALICIOUS

PDF

68.4 KB Created: 2020-11-13 11:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4d4095e11c658e821a9c620e64b15488 SHA-1: b0de77cea7517e556e07bf7bac2903e6bc63a47c SHA-256: 2b81b51113cc57ba40000ccff4e1aa15175722baccb9d09e09d179d2efd7ee7e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate this PDF is designed as a link farm, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=playboy+gary+hart+my+life+in+wrestling In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f951e1e7a6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fa162323585c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5fa8c586af77a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5f952ec451a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f88f36ae415d.pdfIn PDF document text
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/suzovubowojopukiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5f99113f45184.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/3079a7cd-1f87-46f4-94e8-97febd2b5feb/66063077283.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/98079909247.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/sesegabusijenujezebiline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b80c2fc-8bc6-4e29-8aa4-0e399c0c1807/kutimim.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/65989510024.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/64978178064.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_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 5516 bytes
SHA-256: b5591e4f9fd3feec1f9471dc6eca3a7d7ec09c614e15585023f1f3f293e611d4
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10704 bytes
SHA-256: c9357e9403c82d64c62b315f85ac5fea640aedc389271838671ec565aecfdcf8

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