Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafb485e8ed5204f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 00:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8fe10f3863083d4772f3968f1115d3c7 SHA-1: c13b2c8f8962c2bc6bb8e5320918dff4d45daf45 SHA-256: eafb485e8ed5204feaaa1c12dd7c09453edc64e97c6b0667066eeec598d4872a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest the document is part of a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the overall structure points towards a phishing or malware distribution campaign.

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 http://master-br.ru/img/file/guwuxavonewizukulozojat.pdf In PDF document text
    • http://goksirlambinowice.pl/img/upload/files/86900503135.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/jebanurobuvuxa.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/nubazitogaxobojefer.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/24527987771.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-21/20210921150513244508.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091115095973499.pdfIn PDF document text
    • http://innersolutions-uk.com/file/35522990550.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ede98e3e6042ddae2b1af8b810ae726d/81229707377.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/59885306223.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/86244178867.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/63875029033.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/72348803065.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/sedotixebaden.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16147bec34aec8---vopuladiwunetazidumujil.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/situzupolifibamisaradapu.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/74977670763.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/todevafekobajedip.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/73809904340.pdfIn PDF document text
    • http://djpress.pl/Image/files/42276968933.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/rarevalugepataj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=app+to+recover+deleted+photos+and+videosPDF 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_off0000af97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 15128 bytes
SHA-256: bbdb67e9b693d712196d6af4f20c85b3dfbaf8f59f13cc0a3bb5fdfe51497005
font_02_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 10656 bytes
SHA-256: 2acfcbd7e24c804c79f4c8df8f87b1535519f0baf7aef2ea7154b8654e7f11de

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