Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb79e37d983bd1e…

MALICIOUS

PDF

89.0 KB Created: 2021-04-04 20:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b0e6360e0ba65cb05537ffe81db1267 SHA-1: a5b98a3391c1a9c4ec556145a569b7f6fbcdef22 SHA-256: cfb79e37d983bd1e9e2648ab4b3e9a9fbe3442ff4fc2a58a9793138d804fff34
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, indicating a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=all+those+in+favor+say+aye+gif
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/vozumizizew.pdf
    • http://nudevego.iblogger.org/atlas_anatomy_apk.pdf
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/ropanitebawo.pdf
    • http://wovoradomumakil.medianewsonline.com/bromelina_literatura.pdf
    • https://sedonefuwetupo.weebly.com/uploads/1/3/4/6/134669082/7121814.pdf
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/naxeso_fekowefafutos_nemobi.pdf
    • http://guginegafofa.iblogger.org/20348213095.pdf
    • http://vomimaforotagi.mywebcommunity.org/apa_ethical_guidelines_for_research.pdf
    • http://larekew.mywebcommunity.org/teaching_approaches_in_music_theory.pdf
    • http://dotapibipemeza.iblogger.org/nakanedusuludes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://texakotinize.rf.gd/29350700181.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_620f3f93616b430093b0c1e93d5150fb.pdf?index=true
    • http://milebulijulami.onlinewebshop.net/xazekeworerek.pdf
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_8667ba5c148646a1935a073d478827c0.pdf?index=true
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_7c15af15e67343f1b2de1a6779028f94.pdf?index=true
    • http://xomewipasi.rf.gd/baofeng_uv_82_manual_em_portugues.pdf
    • http://minefoz.rf.gd/how_to_set_dish_dvr_to_record_on_tv_1.pdf
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_1eee31365df8407f9c0875cf837137c2.pdf?index=true
    • http://nimozan.epizy.com/espectrofotometria_de_absorcion_atomica_fundamento.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_f62a111833624cdfa28e74e6a3fcb7b4.pdf?index=true
    • 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_off00011c05.bin
441fee9bf9415cc70d68bbfab9ce9b0d694c4c602ec6d33d1a9bc19e11aab562		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 5180 bytes
font_01_sfnt_off00012db2.bin
7741d55ea84e92e115bca0e5ceff03ad31f45fac8cd6360b61b9b56df24bedf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 12184 bytes

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