Malicious PDF — malware analysis report

Static analysis result for SHA-256 656cd0b38caaf085…

MALICIOUS

PDF

78.3 KB Created: 2021-02-26 23:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 669f3555ebe79fc0754c646b44dac54d SHA-1: cd6a4d163773233d61c706fc105c308e86bf1655 SHA-256: 656cd0b38caaf085832d9788de5035c2a59528aaf51a84fa455d6073517fa62b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs point to various domains, likely serving as lures or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=linksys+e1500+wps+button PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379744/normal_6003b9e916de8.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/texojixekopikoxpgbh.pdfIn PDF document text
    • http://vamoktin.ru/bu_bhopal_syllabus_2020_18pb1kz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527902/normal_5ff57f790e13a.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/viwafaxufabuni.pdfIn PDF document text
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/2338461.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/bVzjdov/chemical_elements_contain_carbohydrates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420911/normal_5fc9d0ab0871f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_600c4a5fd49a3.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/bieiehc/stick_ninja_fight_legendary_mod_apk.pdfIn PDF document text
    • https://kigilejujagenit.weebly.com/uploads/1/3/1/4/131438309/tofubiredege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5feaf00139409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gapatija.epizy.com/gopidupubefon.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 5016 bytes
SHA-256: 1b4c214f733281ce69331d8c4a100f7a151589c1c21b927850819ac8238aed38
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 11916 bytes
SHA-256: 2c0659f5ffb1845ce91007ebc4caa3344a734928fd0804e67821adcd94888dda
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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