Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eebabd5ad41c46…

MALICIOUS

PDF

68.4 KB Created: 2021-09-09 11:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e23f237f4030f8b085e46bcd3aebf273 SHA-1: 1c56ded4f3037a9dc786dda2f375d5be9cb901ae SHA-256: 88eebabd5ad41c4612eb9d3ca2a7b2cbd42c1ae06e655bbaffee1057ecade162
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on distinct domains. The presence of multiple embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://kooijobs.in/ckfinder/userfiles/files/19177260715.pdf In PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/fizipukawixelu.pdfIn PDF document text
    • http://maidichike.com/upload/files/wowib.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393cf6b29c5---pemijikebasulaxoro.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/76910725711.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210908_110647.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/87103123640.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/49622625198.pdfIn PDF document text
    • https://mimpidia.com/contents/files/bamunijogoduzana.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/jovedutejipadenexiberum.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/64752051914.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/17387499290.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/zakedewo.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/taxoxobinakinirotesuv.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/betobitakewikopiwu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/29cc79df09da0ad9a62e8bbaec4ac4d3/87528413459.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/40072897294.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/1942267168.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109020950118420.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/76852908615.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/dewarunedelosiz.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/4200183539.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/42148671132.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/mepenudavuneji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=project+cars+go+android+downloadPDF 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_off0000af4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4C 10760 bytes
SHA-256: 144a7034be1526acae3f7020e0db6035cf2d7b87dd92893107a95dfa73d21884
font_01_sfnt_off0000c7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FE 14444 bytes
SHA-256: 1d785d7682df751abe71bfe49c592abf4299247aae0fc71a54ae342405a40f0f
font_02_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1