Malicious PDF — malware analysis report

Static analysis result for SHA-256 58efbb0e45b60d06…

MALICIOUS

PDF

74.2 KB Created: 2021-03-26 10:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 80dc6404c8378a1d51791767d63ea112 SHA-1: 8800ea4356bc3064b899cb46365440272a719e13 SHA-256: 58efbb0e45b60d060f9a6040c0c9c1524729e9d04d56d4f873b6ba0ed1c916d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and a lure related to 'python 2nd edition pdf github', indicating a social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=introducing+python+2nd+edition+pdf+github PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443619/normal_60156330a099d.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/jibjgu3/zofixuse.pdfIn PDF document text
    • https://cdn.sqhk.co/wewowedim/tje2Igh/63185557022.pdfIn PDF document text
    • http://bestsaleshopin.xyz/px_dp_dip_and_sp_in_androidzxauj.pdfIn PDF document text
    • https://cdn.sqhk.co/jadidawa/gGgjgdt/87715695511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_60256beca7465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_60016791e65bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fe6007a9e873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_60198751bad58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481406/normal_6046b494237d4.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/iaJx4gf/kojozibovofonudabuxikemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_6053b1f49e9ce.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/95927449956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_6051fb301c35d.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/Xxegjjm/mipogaxapikolizojew.pdfIn PDF document text
    • https://cdn.sqhk.co/bogonelemid/ijVjjie/21727167347.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/autumn_poem_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/UBijdhb/funozal.pdfIn PDF document text
    • https://cdn.sqhk.co/zojudaje/DFWoSih/societal_marketing_concept_philosophy.pdfIn PDF document text
    • http://italiahot.fun/constance_lemuria_fact_sheetre8qi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisukuvi.atwebpages.com/76618478932.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/gusigaru.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/7604574644.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 5308 bytes
SHA-256: 9b8059badddaafdf11c8f92d3a442b30a9dbb61987427dd359ec7731821eee69
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 10576 bytes
SHA-256: dfa52a4f96b92195ca85f062a2271cbef042500940d8a4298803f8a8af46d19e

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