Malicious PDF — malware analysis report

Static analysis result for SHA-256 366bcd727206923e…

MALICIOUS

PDF

79.0 KB Created: 2020-11-20 23:35:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b23c4c0eed6fd91cac267606ca70df SHA-1: d0e5b3fa720e75efd2c421fd3f954a973c2310b3 SHA-256: 366bcd727206923ebe6b32ad38245195ed35531230a9f833f4c6f8be983049e0
214 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous links suggest a phishing or redirection attempt. The ML classifier and ClamAV detection further support the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

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://traffmen.ru/123?utm_term=my+sisters+keeper+pdf
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f975ee4f390f.pdf
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f8fd13f98fef.pdf
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/219980.pdf
    • https://rewazuxaroro.weebly.com/uploads/1/3/4/3/134341361/pifobijilotamu_fuvozitij_damotoziguna.pdf
    • https://folesatabija.weebly.com/uploads/1/3/4/4/134441350/gugixoli.pdf
    • https://jexewibovagajuk.weebly.com/uploads/1/3/4/4/134485971/dorigubeke_nuliba_witumazewabaru.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/daxurugut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0d3a8b5f-35cb-47fa-8e24-6326bd38e3fb/kap_140_manual.pdf
    • https://uploads.strikinglycdn.com/files/ea31d2ab-2d06-4e48-bc1f-b4a42a67183f/gumegijobujuramu.pdf
    • https://uploads.strikinglycdn.com/files/58404269-24cd-41dd-b604-72309fde65a0/papilas_gustativas_inchadas.pdf
    • https://uploads.strikinglycdn.com/files/a63861f4-8ff9-4292-870d-f586534ea2b7/galatamalagofe.pdf
    • https://uploads.strikinglycdn.com/files/6c42cae7-7398-41df-b272-87f156927d5d/25549975732.pdf
    • https://uploads.strikinglycdn.com/files/bdf1e620-5454-4ac2-a6d6-ff5ef374b151/religion_y_dioses_de_los_purepechas.pdf
    • https://uploads.strikinglycdn.com/files/f536590d-ef65-4646-b2c7-82014d9a37bd/epsxe_apk_zippyshare.pdf
    • https://uploads.strikinglycdn.com/files/0e2c74a0-51ec-400e-8162-0997455789ec/master_asl.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_off0000f937.bin
46bb2d7aae67ffd6c4525029081cbd9f30225187f791917e88558c9503efa651		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 4964 bytes
font_01_sfnt_off00010a4b.bin
1f8be7400c3f79c999c9b735f822e9c78996fde7ae8eb1826a7eff9a98b79cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 10952 bytes

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