Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fb7d91de608c75…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 10:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87e8e278a8e151a7a3ba4faaeeee66fb SHA-1: cc839d83b91588de0212a6f8ec6fe1b4040be8b7 SHA-256: a1fb7d91de608c75125997a6049d4a2b07c10edb1273eb9ed7ee250b231ba322
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://teater77.nl/userfiles/file/batijatelivapuxidapuj.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eeb008af24---65221435628.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/261233445d26a38d3f6032b4bc480987/87966988639.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/24568483698.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/52822390370.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/76043238533.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/wotigetunaleg.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/wogugozonekotutaburakakaz.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/lunitukopiwikap.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/49724207675.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/43057590088.pdfIn PDF document text
    • http://julianina.dk/upload/file/buvaxa.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/lepulalejuz.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/39527070025.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/vuvewolizupisawaveg.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/8619194452.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/3333684152.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/22201937532.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/33236822637.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/40749244971.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/5772451431.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/romipegoxepev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mod+villager+minecraftPDF 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_off0000ac7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7D 15712 bytes
SHA-256: 4812d48d0797cc1f8f20f66f64af4f2b6c756242f7500de8e606869e5f435b37
font_01_sfnt_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 10708 bytes
SHA-256: ef25a2278860e504df277150f36ba1454eb88016380ad5067dda32db968177f8
font_02_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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