Malicious PDF — malware analysis report

Static analysis result for SHA-256 b522e717049a9f68…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 14:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 038fd6964b375122cc5b0af4858452f5 SHA-1: e53ba798f74686f17612da728cddd983a38ab1da SHA-256: b522e717049a9f68b0d979ba8d52b5136091ebb2396bc086eb150f7f38be67d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=deer+hunter+2014+apk PDF link annotation
    • https://x-leather.com/radsportfiles/file/70136389372.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/fitixatabisuw.pdfIn PDF document text
    • http://hijoin.hu/editor_up/kuvibarup.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/kidumoz.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/39094007334.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/85483861732.pdfIn PDF document text
    • https://kuepancong.com/contents/files/83976186742.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/40064978384.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/99539860177.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/64615292470.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/zegofamexizafivowimilitez.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/narasamamavaxipalareruba.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/navone.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/nozejex.pdfIn PDF document text
    • http://egitara.com/upfiles/files/bezagenuzi.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/texuw.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/68839490030.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/tobewovebefavizexunikipe.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/rexowivepakukigiwupopu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/vofiledogopijid.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614085257c049---26887799986.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/79404941493.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/30616728376.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/jutumololi.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/semitaruxalovep.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_off0000b30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 15132 bytes
SHA-256: 7394e722ea7b218b67963e54ecf3805389e1df789b853bed05115e1a2b9653ff
font_01_sfnt_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 10488 bytes
SHA-256: 955b041409696ed1fba4fc08fabd1c29acad5adb69d3b6e8e521ecc505b9f1eb
font_02_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1