Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5d3c61f53da464…

MALICIOUS

PDF

78.0 KB Created: 2021-02-19 07:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 833a876b1ce6aaf82eb9d7058d9dc706 SHA-1: 0e8d19405e29973b9d119fad5efe247e5badd23a SHA-256: ee5d3c61f53da46468482acebd14c419eecb277c0020a6559ecef008250d80d9
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to computer hardware, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=dispositivos+de+salida+de+una+computadora+monitor PDF link annotation
    • http://dalkomis.website/9028852118gf54t.pdfIn PDF document text
    • http://clebohets.xyz/264865807182icm6.pdfIn PDF document text
    • http://mon-cmso.best/229924315185vwbe.pdfIn PDF document text
    • http://furivus.22web.org/lifukemaxale.pdfIn PDF document text
    • http://bezprovodov.guru/fastlane_road_to_revenge_gameclwnw.pdfIn PDF document text
    • http://miniluk.22web.org/silicone_rubber_sheet_bunnings.pdfIn PDF document text
    • http://hamsterbig.com/chili_s_buffalo_chicken_salad_nutritional_informationcrwa8.pdfIn PDF document text
    • http://new-volosi.ru/how_to_program_a_rca_remote_control_to_an_emerson_tvs28um.pdfIn PDF document text
    • http://get3creditscores.info/84379536252stg9r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesudojisa.rf.gd/undead_priest_leveling_guide_wow_classic.pdfIn PDF document text
    • http://xogowakowokavuw.rf.gd/119355433.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/femutegufofobemiwuzetudo.pdfIn PDF document text
    • http://fajesunuk.rf.gd/mirazupolizen.pdfIn PDF document text
    • http://mapexas.epizy.com/37123707243.pdfIn PDF document text
    • http://dazulenaredon.rf.gd/fevalufu.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/namakewusetageb.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/56909993674.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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 5276 bytes
SHA-256: 0571647397745ff1c11b55b1faa4aa75539d13f31be5f6663b216738b8726e92
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 11764 bytes
SHA-256: a63ed6a6a7d11357cd76fdd860b8a116e40b421579f0ae4f6531d21d29157b38

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