Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e85d4385cc26794…

MALICIOUS

PDF

72.9 KB Created: 2021-01-02 04:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddef7378cac0333fb31a320501c4901a SHA-1: d4a3250aa5aba30b861646221abbbe327de42e60 SHA-256: 5e85d4385cc267945101b8b3bcf5df26f77810bba51f3706a4110e4fd895e200
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is intended to direct users to potentially malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=persona+5+strength+confidant+list
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/28d257d7146b.pdf
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fad7092154df.pdf
    • https://watinadapazibe.weebly.com/uploads/1/3/4/4/134492378/pivirep.pdf
    • https://cdn.sqhk.co/nosuterib/MhjnigF/top_online_shopping_websites_usa.pdf
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f946d8fe955b.pdf
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/213855.pdf
    • https://rujusuxiledajo.weebly.com/uploads/1/3/4/8/134861970/sokukawafuwumigodeso.pdf
    • https://cdn.sqhk.co/vekasurox/3heMwhg/hospital_simulator_patient_surgery_operate_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gazijewevan/15724028522.pdf
    • https://uploads.strikinglycdn.com/files/7f146703-6f11-41d9-a3ac-aad2a325902d/39279786187.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_off0000dfb3.bin
1f335e2aa3df030032d16cc4c03d1d02ea4f70a66e097133b704ddb136776968
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 5408 bytes
font_01_sfnt_off0000f219.bin
4fc27ee923740663f21bdd0daa20797282e78eac9062488c2e2d9df26c386303
pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10848 bytes