Malicious PDF — malware analysis report

Static analysis result for SHA-256 73781a836ceba4fc…

MALICIOUS

PDF

68.4 KB Created: 2020-12-25 12:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b521ce418ee76455d35d9929aac2f0b5 SHA-1: f35c96c22321df753e7c78943265b9bb13affbc2 SHA-256: 73781a836ceba4fc883113daaabfe911e8b3647772394b68698159672da4e204
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with at least two pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to a link farm, likely to facilitate phishing or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=vertical+jump+training+equipment In PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/2345741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_5fc7aa947594f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fac2637aa5be.pdfIn PDF document text
    • https://devopududifuwet.weebly.com/uploads/1/3/2/6/132696325/wexofe.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/jbghSjj/harvest_time_church_near_me.pdfIn PDF document text
    • https://lezotaxodad.weebly.com/uploads/1/3/4/4/134432483/8ff8be6.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/4112330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jobavo/60212501577.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/55113028059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8512a661-2d53-4fdf-adde-ab654b84ab6a/botalubum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5e7383-e225-4447-9662-1a62bccb53a2/67893389026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314ec87b-d5f5-4684-86f0-69b908fe1483/649565100.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/lincoln_grease_pump_82050_repair_manual.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 5240 bytes
SHA-256: f45072e1f3e82399ca23da8e252df3e35b04ee4f60abf5c447cf7991f78b1a02