Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8477bc05d84ff12…

MALICIOUS

PDF

83.2 KB Created: 2021-06-06 06:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4930941304e589314dfe370055b7cd11 SHA-1: aedef0b53fdd9f7981a1178afbad988359cd5d8e SHA-256: d8477bc05d84ff12785866a947b8acd6af6bba01de26931ada0eb282ca248ccc
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'https://jacksth.ru/123?utm_term=derive+vertex+form+of+a+parabola', which is likely used to redirect the user to a phishing or malware-hosting site. The document body, though heavily obfuscated, suggests a lure related to deriving a parabola's vertex form, indicating a potential attempt to deceive users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://jacksth.ru/123?utm_term=derive+vertex+form+of+a+parabola
    • https://cdn-cms.f-static.net/uploads/4378621/normal_602ef68077d89.pdf
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fcbc05c23024.pdf
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5ffbca026cacd.pdf
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5feef6eb6be55.pdf
    • https://static.s123-cdn-static.com/uploads/4405922/normal_5ffbf7f20cb51.pdf
    • https://static.s123-cdn-static.com/uploads/4469631/normal_5fe2aa4e2d2c0.pdf
    • https://static.s123-cdn-static-d.com/uploads/4496014/normal_60b27afcd12d1.pdf
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5ffbcc4ea3f9e.pdf
    • https://static.s123-cdn-static-d.com/uploads/4468871/normal_60b1496590428.pdf
    • https://cdn-cms.f-static.net/uploads/4381531/normal_603f46dee1314.pdf
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fe500a9a67d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pojaweku.pbworks.com/w/file/fetch/144595731/panawoloduw.pdf
    • http://watusuxipidu.pbworks.com/w/file/fetch/144559791/minecraft_pe_shaders_download_android.pdf
    • http://furalagaposu.pbworks.com/w/file/fetch/144567363/50011799359.pdf
    • http://xuwuziz.pbworks.com/w/file/fetch/144514314/13643436363.pdf
    • http://jabodawo.pbworks.com/w/file/fetch/144609243/income_statement_format_download.pdf
    • http://dadilotofexi.pbworks.com/w/file/fetch/144504987/kiwi_bird_drawing_tumblr.pdf
    • http://fuvotobike.pbworks.com/w/file/fetch/144695112/xinufizikuwuxubodirirale.pdf
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423594/65741816773.pdf
    • http://zekodunu.pbworks.com/w/file/fetch/144464601/wajagapikapajife.pdf
    • http://zeratuwolima.pbworks.com/f/44554957852.pdf
    • http://wasazejis.pbworks.com/w/file/fetch/144603900/the_kissing_booth_noah_and_elle_height_difference.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144412215/adobe_photoshop_classroom_in_a_book_2021_release_download.pdf
    • http://wojoxevom.pbworks.com/f/fivipudurexotozage.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_off000108d6.bin
0871666e3e43ad89e19775086f7ff577a73f6f232004fa8a92b35d795426fb33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 5136 bytes
font_01_sfnt_off00011a43.bin
98c26bb8dcb7525467c4eeae88747b1321378ee3dce220b1b7a84c27e3e57f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 11048 bytes

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