Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccce8d895fc9fd2e…

MALICIOUS

PDF

73.3 KB Created: 2021-04-01 05:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cd848e546a5e00b5a1ff3dd636f6f6b SHA-1: 728bb03c4f35b1cdd7096bbb45743c92bbd40179 SHA-256: ccce8d895fc9fd2e72d0039ed8d3ede5ac91faade1b76b359a22b71110d5ddbc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'https://maypoin.ru/wix?keyword=amendment+worksheet+pdf', suggesting a phishing or content-luring attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=amendment+worksheet+pdf
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/5986453.pdf
    • http://ruregere.sportsontheweb.net/ancient_civilizations_timeline.pdf
    • http://gojifenap.22web.org/how_to_draw_a_boy_anime_step_by_step.pdf
    • https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/9c3100bd829ace.pdf
    • https://futokodoneru.weebly.com/uploads/1/3/0/8/130814407/lufejemurivijojeg.pdf
    • http://raxewaponoxiv.mygamesonline.org/vewowubuvezowifasegugarup.pdf
    • http://takipibimaxubov.sportsontheweb.net/widedileru.pdf
    • https://berajodisi.weebly.com/uploads/1/3/4/6/134651265/9232725.pdf
    • http://xatarekinusafo.iblogger.org/webaxujinoxamizubeniga.pdf
    • http://pujuburebofig.iblogger.org/stop_motion_animation_techniques.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadobirak/kofidezivefaketozuvu.pdf
    • https://s3.amazonaws.com/leributafa/wizab.pdf
    • https://s3.amazonaws.com/tiniruru/how_to_advocate_for_social_justice.pdf
    • http://gisebebego.rf.gd/45846516352.pdf
    • https://s3.amazonaws.com/fulazelof/95013330993.pdf
    • http://sapakebozo.rf.gd/fijano.pdf
    • http://vamavaremimot.atwebpages.com/plan_de_negocio_para_abrir_una_cafeteria.pdf
    • https://s3.amazonaws.com/pirofopafu/science_process_skills_worksheets_for_grade_7.pdf
    • http://giwoxut.rf.gd/lujumopexubikisad.pdf
    • https://s3.amazonaws.com/jevedijadiki/adobe_photoshop_windows_xp_32_bit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e349.bin
d88d76401359cbeb08e7fb4ddc68235e6b786a4e0d19003a9a77129fcbfd9ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 5184 bytes
font_01_sfnt_off0000f4d5.bin
17b139acde2d0f439a25c5a0640482b0da3f0530fa1d20bcd442cdcae4bb07f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10308 bytes

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