Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff73c14dcdb8cc32…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 20:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d857328f35410db7d7238df50fce1dc9 SHA-1: 876ed408b0f8f259650c071672c0787b8fdab520 SHA-256: ff73c14dcdb8cc32f3c1f4eab60c50249a32b668604a4a5ba29fd021a16a4ea1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

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 https://infrive.ru/uplcv?utm_term=screen+mirroring+smart+tv+android PDF link annotation
    • http://wuchem.com/upload/files/luvadisebozevaxub.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/pozovazajelowazotivemon.pdfIn PDF document text
    • http://chipgene.com/image/files/20210922_083319.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/vamawibilimub.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/98987035372.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/mesusetijoj.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/fozizakatagewerigenomutu.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/10572854447.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/36695205215.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/dituribelafodejabavodofag.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/siwego.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/razodezomozetopuxesala.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/92385313445.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/1299378774.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/futofagafa.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/81128682089.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/5823774222.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/giteve.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/54208572769.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0c1bc1a524cebb564aa0b128adcd3357/33381409539.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/bipivarizati.pdfIn PDF document text
    • https://simorgh.it/uploads/file/70681918859.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/40972915676.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/46192317836.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/jasowezakoburexibemizal.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_off0000b22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22E 10808 bytes
SHA-256: 82078527dbc1502be938294396e3d427ef6cc09beddd36931cc4795564d2be8c
font_01_sfnt_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 17304 bytes
SHA-256: 73be5a6336e0ce14cd5640cc3c5fbb0c62b24879f65c74760a92a48dcae1d34e
font_02_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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