Malicious PDF — malware analysis report

Static analysis result for SHA-256 4193d63ff9fdfbec…

MALICIOUS

PDF

62.8 KB Created: 2020-11-20 02:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a808b928ee63308e4fc6cbf22ca96d2 SHA-1: 1dc03af8c06535a4c920c67eca57d9f997fca794 SHA-256: 4193d63ff9fdfbec4962dcff6bdcb6d2b6c325d1123a25fe1682ab96a6e8a4ab
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a strong intent to direct users to external, potentially harmful, websites. The ClamAV detection further supports the malicious nature of this document, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=flight+training+manual
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fa51a79121e0.pdf
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5f9a682ac88c1.pdf
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5f948c4580e7f.pdf
    • https://cdn-cms.f-static.net/uploads/4459188/normal_5fb54f5b0071c.pdf
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f8da7866aab8.pdf
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8e9823053f8.pdf
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f92eb3673db0.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8b934073a54.pdf
    • https://rawabibag.weebly.com/uploads/1/3/4/8/134870232/1780712.pdf
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8aa633b84a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bf077eaa-7f22-40ea-92cd-a24f989c49d0/sizuriluradotorofuxix.pdf
    • https://uploads.strikinglycdn.com/files/3550a53f-85b5-4bc5-8eb3-cce8243ab6de/xebozexabire.pdf
    • https://uploads.strikinglycdn.com/files/9cd2ecaf-cba6-4b57-ae5b-70c7c50a74ac/rixut.pdf
    • https://uploads.strikinglycdn.com/files/29bcc979-db34-41b7-8af6-8aab19b85aef/fopebefatanivaburagapamo.pdf
    • https://uploads.strikinglycdn.com/files/dbe0d986-d564-4578-8521-d17ccc2c43cf/nesobizixanewotodaxuko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a7.bin
ac54850e945d0a9f63c2d4b9806278fa56d83e5f198a7a34fd16fb1cf37141c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A7 4876 bytes
font_01_sfnt_off0000ca14.bin
a45279b4cb25f06944024fd551e4d2f1b9da55118a2f48722d4ccfa33d8b1d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 10696 bytes

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