Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe1fdafdd69f441…

MALICIOUS

PDF

77.4 KB Created: 2020-12-06 22:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303298a49b995537d8f360dc36a2bb69 SHA-1: 5a74f6b9b0905c41d94340e5441af1995be416fc SHA-256: efe1fdafdd69f441b359c5be70f8fe6591a32fccfa3f15f072fb87ec373d3380
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files, a common tactic for SEO manipulation or distributing further malicious content. One of these links, https://traffmen.ru/123?utm_term=cliff+swallow+vs+barn+swallow+nest, is identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=cliff+swallow+vs+barn+swallow+nest
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/potemujax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc68db56609fd0ee7b8a05a/t/5fc7e5262b4aac18447b1885/1606935848988/preschool_coloring_pages_free.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcef4364be903ae63ef49b/1606217540582/26417220715.pdf
    • https://s3.amazonaws.com/jemisajoda/simple_project_timeline_template_excel.pdf
    • https://static1.squarespace.com/static/5fc118153dfdd95b60d632f0/t/5fc67b3b18e72e5fdbb818cb/1606843197955/guwusepikene.pdf
    • https://uploads.strikinglycdn.com/files/103e374b-5fad-4494-a2fa-ba2fd319b14f/bovotupaseberadofimakok.pdf
    • https://s3.amazonaws.com/bezegoluzose/91953014870.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf67013570fb44d1faded6/1606379266500/60561184410.pdf
    • https://static1.squarespace.com/static/5fc101f96609fd0ee791e489/t/5fc1bdce1972c46e3cdf6414/1606532561987/lowes_toolbox_grant_application_2020.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/jogogusotawexomolo.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_off0000f39e.bin
948239ee348eba3adbe1f636d5bc13430d2cf4d166f28932f316c0e5fab46ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 4956 bytes
font_01_sfnt_off000104a2.bin
6f3ddcd075a580ceda8ab6f306ffb8b44766f11c9c31a3ea20e07b143e6d8eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 10620 bytes

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