Malicious PDF — malware analysis report

Static analysis result for SHA-256 08425a71d369ef74…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 16:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 03e7e695023adef7f3475b9326df93ec SHA-1: f5e2158ff28db1448c3ccc9cd78ff8f76847aec7 SHA-256: 08425a71d369ef74f969db3dcc7d0ad1af1e7fe6d0d8bf4c9101787f7baa4437
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://mrukseo.pl/userfiles/file/rojagojotuze.pdf In PDF document text
    • https://sakkestadbil.no/userfiles/file/46467921581.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/padebipijikevetijoxumev.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/7449920333.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/mevajajebafuzufiso.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/4741940959.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/18157486404.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/lidetubugimupitoxenafo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/32125954184.pdfIn PDF document text
    • http://school15-tyumen.ru/f/27639797627.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/51474383402.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wasezigoniwalosugeve.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/93543029818.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/pisubevotivam.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/89631987419.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/dasusitaxudatuvas.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/vuxakeroxotolewiwamol.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/mipixoxiritukimib.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/42209165600.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/8737049778.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/66921524738.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/vifewolufa.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/983f6b1e68dcc1bfa673108f579b09d9/jiduvefomuruzokirubu.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/loxaguzarugodezejuposa.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/5603899161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+remove+old+bluetooth+device+from+androidPDF link annotation
    • 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_off0000b08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 15688 bytes
SHA-256: b99b0b2561f0dfa227ef39b399757c704bfcfab94de0ca96c35f5f5f4866a973
font_02_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 10956 bytes
SHA-256: 93ec1465f2d6c1a663bae4156749188eb180dbcc3d8bee6154c92f141e684cf3