Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e9eb4860176ee9…

MALICIOUS

PDF

74.2 KB Created: 2021-03-18 02:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48b660b6c993d374bde81e977ac20dcf SHA-1: dfc923675cec4c3d46109f96a0977ead51f554ba SHA-256: 95e9eb4860176ee932dfeb04e4956bf0abbba2a430c389a60b11b3f4a15b5275
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search results. The primary URL, 'https://druttle.ru/wix?keyword=codehs+data+structures+answers', suggests a phishing or SEO manipulation tactic. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=codehs+data+structures+answers
    • http://robugipunebib.mygamesonline.org/39199322004.pdf
    • http://vannabanyavsedela.xyz/free_chinese_checkers_board_gamel5vkj.pdf
    • http://sis-paypal.com/67902674968aj73a.pdf
    • https://kikurebimeko.weebly.com/uploads/1/3/0/8/130814200/jonogujog_poguvav.pdf
    • http://bikelumonekodex.mygamesonline.org/cement_manufacturing_dry_process.pdf
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/9859578.pdf
    • http://paypallsecurity.com/diwuvagufolezikifemoxuda7e3ms.pdf
    • http://feludekinopotas.scienceontheweb.net/84661212078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_226da3f2c6884033be9398f862500569.pdf?index=true
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_ba863e0e729444df931f96e86558a922.pdf?index=true
    • https://s3.amazonaws.com/lososimap/bamboo_wood_sheets_australia.pdf
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_694cdd3282204bc0b862b86e9e1f3019.pdf?index=true
    • https://s3.amazonaws.com/pafiganovavi/armored_core_4_answer_ost.pdf
    • http://vefuvepux.epizy.com/cambios_fisicos_psicologicos_y_sociales_en_la_adolescencia.pdf
    • http://bajofot.epizy.com/bazit.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_7fac03f128c04af883db04bbc1421a8c.pdf?index=true
    • https://s3.amazonaws.com/xedewofuretujo/wufixejimokokovuxixux.pdf
    • https://s3.amazonaws.com/juduk/citroen_c3_2018_manual.pdf
    • http://tejusadesivuti.epizy.com/oppo_105d_dac_chip.pdf
    • http://zuvugogab.epizy.com/acet_syllabus.pdf
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_2230f7708c2642d4b1d036d07eb38e91.pdf?index=true
    • http://wisunomimat.epizy.com/60007116248.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2bf.bin
63ba8fa83a8c29493629489846e7a957e67b7834ac055142c1b9983722fa8047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 4992 bytes
font_01_sfnt_off0000e3bb.bin
07ea8ea9c21542e332beb3584abb158dea3d996cd6572a63bc7a4093a5eb6555		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 9932 bytes
font_02_sfnt_off000105e2.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16204 bytes

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