Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5320a590bdee72…

MALICIOUS

PDF

81.1 KB Created: 2021-10-06 18:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f5812cb6435871d90ced0c3eec8efc62 SHA-1: 92c4fd3e089398ed5b828539a2ced355ae3b1556 SHA-256: ae5320a590bdee72c74023b11f9321bc827cae92e99e9526db5aceb626435ca7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating phishing and trojan characteristics. It contains numerous external links, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dodomacnosti.net/data/file/zelatusimamanobinofinizak.pdf In PDF document text
    • http://studioferrato.it/userfiles/files/wavulewomifov.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/rexeritulunozab.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/bugureburaw.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/94942159494.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/wobobukekafax.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/45282506274.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/kovisarefivelaxutek.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/mifasomapomosoto.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/limamidupetilasez.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/99743797528.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/koxojozenasujopeduzuvo.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/69300000345.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5b90faee0411c35bee87e018ff316e03/774215844.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/fivoluwumakabidojedaloz.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/59077931691.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/14750640539.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/eq2nbcme2718319lelclsbnobg/kumifawavanawexo.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/62629510906.pdfIn PDF document text
    • http://sanjarbek.uz/userfiles/file/53399133091.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/66308773963.pdfIn PDF document text
    • http://saint-party.com/media/file/wodaguwekisanopesafenija.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/rolabusibenekufom.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/35636466554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=comparatives+and+superlatives+reading+comprehensionPDF 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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 18668 bytes
SHA-256: f7c3097c65596f7c1e4697e64cb564f949d12145c9e4c64fbbc2c63b02d050e6
font_01_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 11160 bytes
SHA-256: 737a4390550b677bd8be1171f2f83da39691a7988cb7d7e650deb17cc99e9929