Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fbbf218442cb00…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 17:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ae38d5e89c073da8f408b2ac9ae984f SHA-1: 0dbe95be12298f04a7feb1416578edbfc7382426 SHA-256: 89fbbf218442cb00051735d57cd0f7bea1138cd9551cbfbeae5a8cfe09c2ce86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm, likely to distribute malicious payloads or phish for credentials. The presence of embedded URLs suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=justice+league+lk21 PDF link annotation
    • http://lanaecoloridabruzzo.it/userfiles/file/fexejez.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/39267282472.pdfIn PDF document text
    • http://kftchem.com/upload/files/326227448.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/dimewovok.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/zemulizerofatesaga.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/54866524273.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/85005557001.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210906_F3261C0A565190D3.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/29557567089.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/xigiselojegisotumowilejuw.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379ab95061f---53710490961.pdfIn PDF document text
    • https://tepihtrava.rs/files/panapisekikeju.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/nagejewegisaritoj.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/28578207608.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/jebuxa.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zimiluvipuwizimenifexiw.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/46177662481.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/zuxuvipusigolilomo.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nowuxijagemume.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/70174279777.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/91250054696.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210911010223.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d693856b---67115343001.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_off0000c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 10436 bytes
SHA-256: e4854d94db60a899ba5d1e93181d2e23c2f53ce345fba3e510afdd096c670418
font_01_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 17148 bytes
SHA-256: 09de07857177c66f9ea3d093573ea715d75cbb93b9fa649906ca3ec1d95f3ddc
font_02_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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