Malicious PDF — malware analysis report

Static analysis result for SHA-256 49204bfb726c56e5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-28 07:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: be5fefd9e345b526a5b5c448e2a96d69 SHA-1: e55657ee24cf7bf4e59071b12f92a7f4ccb9ccc7 SHA-256: 49204bfb726c56e5349628bcebfade23fbd96bec2cf778a0b7e14071ceb8c06c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. While no scripts were extracted, the structure and heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://10kshot.com/customerinterview/ckfinder/userfiles/files/vigadipefekomakinexiteb.pdf In PDF document text
    • https://foundationkuzmanov.com/files/34895203500.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/1714343566.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/16994269328.pdfIn PDF document text
    • http://immopolignano.lu/images/woxazizodegutadis.pdfIn PDF document text
    • http://hotechike.com/files/files/fepesobejawesixe.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/80471978484.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/jizipufewuxubokibubel.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/38071963670.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/53999414584.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/48937424737.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4c8963877588f6ddc1ec18b2aadf1e02/16750257768.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7997bdd914c550843f9f93cd3dd5dd9a/sonodolediveropor.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/gekonuvukuzego.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/26948050438.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tufeduwosukakogakotilo.pdfIn PDF document text
    • http://voijin.com/userfiles/files/vaduwirorulabapovawiko.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/tuvovibum.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/45245966841.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/ramowazizowujogil.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/pimixosujiseresene.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/77446426386.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/77501199973.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/13720435631.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-21/20210921083227262108.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/rufewatogoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mayweather+vs+paul+onlinePDF 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_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 10708 bytes
SHA-256: ed04bd48c867ee8340bf9ea54f83bd4845e29ae58cc53c678c8c9583a2270946
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 20304 bytes
SHA-256: 6a2fa1b4989f31a17c9a83c5efec375b319cb9831fb335f75ad7ce2750ec0e27