Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fe1db2f0851ba4…

MALICIOUS

PDF

73.6 KB Created: 2021-03-02 11:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b4df12be077d008403db723533c3f67d SHA-1: ff1256e814ad6e33583827c2d1142096fefd5710 SHA-256: c3fe1db2f0851ba4684045e602a805dd7c8ec559df556ecf1b67d88b55f4821c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://mezovuduw.ru/wb?keyword=peter%20singer%20why%20vegan%20book', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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 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://mezovuduw.ru/wb?keyword=peter%20singer%20why%20vegan%20book PDF link annotation
    • http://intereriia.com/7927058388014atc.pdfIn PDF document text
    • http://vandify.com/assessment_for_learning_formative_assessment_oecdfmzq2.pdfIn PDF document text
    • http://didezidise.22web.org/bahubali_2_movierulz.pdfIn PDF document text
    • https://kusijavi.weebly.com/uploads/1/3/4/3/134385668/muvutapixe.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/ec1b0fa38619c8.pdfIn PDF document text
    • http://ninujovapazolo.iblogger.org/forrest_gump_main_theme_piano_sheet.pdfIn PDF document text
    • https://tokebezewala.weebly.com/uploads/1/3/3/9/133999388/8583389.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/563968692187e5gh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/attack_on_titan_a.o.t._wings_of_freedom_gameplay_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/74811592546.pdfIn PDF document text
    • http://davojuke.epizy.com/nunebuwakilizelabu.pdfIn PDF document text
    • http://fiwujugisijema.epizy.com/how_to_tune_jumbo_universal_remote.pdfIn PDF document text
    • http://wekameti.rf.gd/1997156817.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/sheets_of_plywood_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/lipikamonalejiwasedekenex.pdfIn PDF document text
    • http://momugegunimex.rf.gd/download_running_man_episode_lama.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/tibibogujod.pdfIn PDF document text
    • http://vafowoloxesimam.rf.gd/7071988514.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/all_the_biotic_organisms_in_an_ecosystem.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/regavowunikivire.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/dipobutobi.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5376 bytes
SHA-256: 67cbb733acf20f428c89593416cce23ca67729e445ca1cf2bb43227df6ac5237
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 10544 bytes
SHA-256: 6568298b257cea333de3ab597df9f90373373f9c39b6064e0388022f4f580e20

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