Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79173ef3f483939…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 19:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93f01eff30f7e2b461f8a294e9556faf SHA-1: 68ad18838b8c9a929aa5559a38cec41d27d258ae SHA-256: f79173ef3f4839393bfd405c720f802ff087f33881c8f3a14717b38b42c60eb1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially malicious or disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381979cca0a---46616778284.pdf In PDF document text
    • http://ellenia3.eu/userfiles/files/wutasapazunudotudol.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zuzovisub.pdfIn PDF document text
    • http://belean.pl/userfiles/file/24776617450.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/62410922193.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/wasomoverewusot.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/35445881657.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/8670420241.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/36029511761.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/vavujaj.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3c6c66648b92ead1e46da6667147f807/rakamezokirolexar.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/menelabodakoxo.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/7084756551.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/36839703731.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/tipoxajigezejos.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/1730827214.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/20663206620.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/tusevaxuxubavesikozulidi.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/15767043429.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/jukadapegak.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/lurewes.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/88287886865.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/garubomoludowafabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=d%26d+3e+monster+manual+pdfPDF 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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 17952 bytes
SHA-256: a7a3897374844aaf46cf733428178dcf6822bb403ecacefc40a20e980c17b54d
font_02_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8