Malicious PDF — malware analysis report

Static analysis result for SHA-256 33af416115aee712…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 09:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abe76e0a1ac423c596e8dab00df6e597 SHA-1: 2a137d278eb547ee184fe8db5c65e6d874eac432 SHA-256: 33af416115aee712ffd3a2a268ff691edd79498f6b7e3631cbbd8f8b2aee75f0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=vpn+master+apk+download PDF link annotation
    • https://radio-clipa.ro/userfiles/file/wimupijimoreroxu.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/raredijojer.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/18627493801.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210914055624.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161351fdc2b7f3---lasiromedow.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/97165234368.pdfIn PDF document text
    • https://angkalaris.com/contents/files/24696471558.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/sijogapot.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8742e8fd6eb7ad1a3fe60b60a8053940/gufaxabenanudobibevo.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/suvur.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/nojizesasewogamevuton.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/36617158555.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/vuzedoferopudijadokas.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/89837155057.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/lomufogopenepufesi.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/89323254636.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/lawuxunubakajoxar.pdfIn PDF document text
    • http://rayer.cn/d/files/zowukez.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamozubigidimararupuwaj.pdfIn PDF document text
    • https://biocoils.com/img/file/51990446464.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905041153295.pdfIn PDF document text
    • 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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 19512 bytes
SHA-256: 0123580f429681e39d58fdfda4802e8ed9d2d3b48b9f3cbbe309aeba7cfdd291
font_01_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 10608 bytes
SHA-256: f41ee157eddcfe8e9da30da69b4d6ed4718e58ef7c63e4abb6ea61d4523dc3a0

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