Malicious PDF — malware analysis report

Static analysis result for SHA-256 2770934df2eda301…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 22:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75c9780cb250a70ae653255089e43ac2 SHA-1: 1afa6b3ff21ee8de88337d6723865177f058d6b3 SHA-256: 2770934df2eda3016f1b42430ca258a5ad9581f6cf446a032aae5930222ee596
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, such as 'https://catamma.ru/uplcv?utm_term=boruto+online+subtitrat+anime+kage', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://catamma.ru/uplcv?utm_term=boruto+online+subtitrat+anime+kage PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133465d042a3---nunobugasojoxokukomegusu.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/25058163780.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2fadb7dcc---gemolefelokazozurifa.pdfIn PDF document text
    • http://bulmarconsult.com/files/81022116453.pdfIn PDF document text
    • https://shunnasato.com/pumuxepaxokasewo.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_A4CC275BE0BDC8B7.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/49909800133.pdfIn PDF document text
    • http://millecolori.it/images/file/xupikaj.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/97866032558.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/21821345930.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/kuteb.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/zarudatojoza.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210904_70EB6FBFBFE81931.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/43527606489.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/51741198353.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/6394074722.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907123003.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/banatanukosixitavogisaf.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210907165851.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/jamatirazomukazozesisu.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/todirigi.pdfIn PDF document text
    • https://istanajp.net/contents/files/47638999486.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/17230301620.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/44803771954.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 20312 bytes
SHA-256: 190b3b2d5abe39d45d635e08352b5da20871411f726993733aaa6c811b306793
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 10836 bytes
SHA-256: 001cbc3d821be875468fa9be82bef15f5702cabf113117629535bb7c4ecea376

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