Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f3e1bd0547ae07…

MALICIOUS

PDF

80.4 KB Created: 2021-03-04 23:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 474ff0cf9b5ec59d5af96a8e3378167f SHA-1: f0bdde787d116b671399a8b5155aaab8e4dd4940 SHA-256: 25f3e1bd0547ae07042aacc39354a1639877edaa70ec2d9702b1925500b726f9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to potentially harmful sites.

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=how+to+calculate+enthalpy+change+of+solution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475863/normal_60348dd68962a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_601ff14a9e8c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404524/normal_5fe59874a5154.pdfIn PDF document text
    • http://pimolala.22web.org/pijovabulogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_5fdb5d2678cc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5ff25db03e327.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/13160435329.pdfIn PDF document text
    • http://butitami.22web.org/60639349654.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/its_never_easy_to_walk_away_let_him_go.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_603b9d24a8bb1.pdfIn PDF document text
    • http://lujuvudav.22web.org/42939548502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60356f8b2875e.pdfIn PDF document text
    • http://povoponikevave.iblogger.org/lejabimafotada.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/zovos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_602ea27317503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wanedinak.epizy.com/duxudabavusamegidutarozor.pdfIn PDF document text
    • http://datufubizut.rf.gd/78382481569.pdfIn PDF document text
    • http://tibelobal.epizy.com/r_programming_language_tutorial_youtube.pdfIn PDF document text
    • http://gomupinoteripa.epizy.com/vitowidarufejefajalig.pdfIn PDF document text
    • http://donotalu.rf.gd/parekuxefulaz.pdfIn PDF document text
    • http://xutomonil.rf.gd/dell_optiplex_7010_network_driver_download.pdfIn PDF document text
    • http://nofalowi.rf.gd/beloxikomimogotezogofev.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_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 5336 bytes
SHA-256: b6021cc56448626f995c0c16b3dac456b892363850e1023454329477207c764d
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 12004 bytes
SHA-256: ef175f17b2712b5fdae240d6618936860bd607f2fbe7da67a251ad073dad49d6

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