Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb906bac7359ea6…

MALICIOUS

PDF

83.8 KB Created: 2021-10-07 12:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a7bf265135f08b3722ccbd7420f4f1d3 SHA-1: 0b592d2219a2ef8f925b28af6dfd233574ba80c2 SHA-256: dbb906bac7359ea6e43621d4f6accc260b89ba5981f1ba7cd4f7568abd5c0e4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains embedded JavaScript, indicating an attempt to execute code. The PDF also includes numerous external URIs, many hosted on potentially disposable domains, suggesting a link farm or phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://otvorene-srdce.sk/userfiles/file/74048117282.pdf In PDF document text
    • https://yunglin.com/uploadpic/files/ritewogodowe.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/povinuwije.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/569037299.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/bezasanupabisuja.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/46628447703.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/joxemowakutafesokomozivak.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tazitagojojelawejabemufuv.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/24861714969.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/jalasikol.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/49170460686.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/tuwisusiren.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/xarogofisuz.pdfIn PDF document text
    • http://neuroxl.com/images/file/36141993945.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/49483373665.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/26785902237.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/84671718007.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/93337798859.pdfIn PDF document text
    • https://afma.pt/site/upload/file/vifigubigubatejawefogab.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/galekizomepexoretebapose.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/xorigepivefutidozaj.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/61406032122.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/wonifadubititiwududum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=verbs+that+do+not+change+in+past+tensePDF 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_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 20540 bytes
SHA-256: a7c6600a619b894cfb7a88b027ea2ed781669f096dd46b919fd0ebb56c453954
font_01_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 10856 bytes
SHA-256: 44a0482467f3809b4ca418418ffd4a28f59088d912a0affe3f40ce3c425a970c

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