Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c98dc5d568fd850…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 14:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 01d4c2cbb946f81ce80159c38a3c21a8 SHA-1: d5135b78ca63492099d0b5bd508b1b5ba9e4aa3b SHA-256: 8c98dc5d568fd85073744182a290b8ffc14c17f6e8e86a22167694b50beee0f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=convert+exe+to+apk+on+android PDF link annotation
    • http://nitexprofi.cz/userfiles/file/60416325246.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/30491671926.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fefopetuvopipiwukosixig.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1ee434be6e87e78ffd3ead68f1243e2c/sesopamavi.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/metileneme.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/69767009711.pdfIn PDF document text
    • http://alkanboya.com/files/file///45032931127.pdfIn PDF document text
    • https://nexusmediation.nl/files/27976938343.pdfIn PDF document text
    • http://cascad-trans.ru/files/nanumatewisoritubet.pdfIn PDF document text
    • http://crm333.com/documentos/file/vimimemibamomub.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/32454253029.pdfIn PDF document text
    • https://renteci.com/imagens/file/32058987986.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/75316252179.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/80353027033.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/musereloriremenujufilo.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/66004601741.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/72589067272.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210924181118.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/pizuxonepolulabenoped.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9n8ifeld8bh90a5i60pn592rdt/77588980202.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/lupofave.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_off0000b1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 10460 bytes
SHA-256: e3d4d0c4538a853d7ff5cff9a6171097d1ae74d89479d4754c5707e69453df92
font_02_sfnt_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 17352 bytes
SHA-256: 391a14f45f93be9575caa5b0c55d1eda1c6ac50d001edf9115b4c8d688642ee6

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