Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b58ab1cb5b7139…

MALICIOUS

PDF

68.1 KB Created: 2021-03-23 20:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc9780d2d98ea7bdb7e89a28a5ae7876 SHA-1: fb1b0ce8853451b99f4e69b242c8207c4209fdb5 SHA-256: 23b58ab1cb5b713999d63aeb7f056636b9bb6545544133901617404d837cd44b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=corsair+k95+rgb+replacement+keys PDF link annotation
    • http://pixunune.sportsontheweb.net/88267312577.pdfIn PDF document text
    • http://kajipim.mypressonline.com/decision_tree_regressor_sklearn_parameters.pdfIn PDF document text
    • https://subafoxa.weebly.com/uploads/1/3/1/3/131379179/reluzibuti.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/0d9eb49.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/ccna_security_2020.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/7210019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_81354707794743edb0114b547af9ac05.pdf?index=trueIn PDF document text
    • http://guxejusoselota.myartsonline.com/53462075424.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/vezigufagasodinasama.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/forrest_gump_main_theme_piano_sheet.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_cc6bd7f88b224cc396e3a14afc94a047.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_044a4e9dddee4ce0af066a7a4fd6567e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jijari/naming_ionic_compounds_with_polyatomic_ions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/35331407840.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/compact_android_phones_2018_india.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/go_math_grade_1_chapter_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/tegux.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_a2ef3534201e4c6fb3601f87ffd14e2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/o_l_papers.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_d69c210519e141be8ca8aff766b4d449.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirosisob/mudaropawodufewam.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/3676772504.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/15117541153.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/32181566625.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_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 5744 bytes
SHA-256: 5176a29eb4e5f30ddf3f7d46805a6c99caf5948a944e9feac328965af4dd9524
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 9912 bytes
SHA-256: be92e9a22148c41a7768aeb2e02efe821d5ebcad6ef167e0934b88a5f540b41d

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