Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08fcb6f6e90538e…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 15:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4726aeb48a473a6ba9f76c00630631b4 SHA-1: 8d4c62389084b4201e7830d501dd0168caad829f SHA-256: f08fcb6f6e90538ec4dcfefb43e19d466e933db147955866031ecfdbb645285a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=warship+battle+mod+free+shopping PDF link annotation
    • http://studioiulianella.it/userfiles/files/8356766309.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/bewazurizopobetevow.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/jutabe.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/63937096357.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/93821601086.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/dadifitujeganurusonolew.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/saxitabokas.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/gitedinuzerolises.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/podumofe.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/joresupo.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/42660160093.pdfIn PDF document text
    • http://salwex.hu/file/dazenasaposeginus.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/35188080830.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/49891187585.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/bodereje.pdfIn PDF document text
    • https://cncunse.com/d/files/2374963302.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jevib.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/90595774606.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/93975601910.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/rd7djmp9fb2s2b97tuhs6742pu/bapojoresiwegegamuratad.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/19279147824.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_053012.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/14270354772.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_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 11076 bytes
SHA-256: 39a4e14a70bc6e35bb02f5347295db7e411101c678f9f11713dd1c22d1585d37
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 16416 bytes
SHA-256: cb7d8fec6a4729d39088a08e0b0e01fcfcebb9b90b967dafe5a519590262d1f8

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