Malicious PDF — malware analysis report

Static analysis result for SHA-256 4447951b206dc1cb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 16:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32cdc9c7960cb45703fc6a5d4a23913e SHA-1: ccad714e1bea8dee332259809d772a94c712be4f SHA-256: 4447951b206dc1cb5d265e5e7798a62cfbebf61ffb705f8d8f6739a9fe1db5c1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=airdrop+nearby+share PDF link annotation
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/vurexude.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/12293558820.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/ginow.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/65406205352.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/85529317549.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210908032927.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59619853511.pdfIn PDF document text
    • http://askaudit.ru/price/gigolexafuribiredamilud.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/94025514844.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140e66d251a5---wefoxe.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/40233349220.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/gebivopeledusosakabonuni.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/danevopibidujo.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/nozisobajoromevumozefom.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/furonuli.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/92540222399.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/23413089833.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/fowilu.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/71683442924.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/87023039898.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/nolimofuniboxute.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/33401374764.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/73094927534.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/geviletezof.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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 10580 bytes
SHA-256: 011f6756ec2975fcf2e45012e6b736a6e6b03190f2bf2a2bb87050c116b85f68
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 17916 bytes
SHA-256: 05fe95f2d5132b764206e40348a86218d595a37ef658419de806f7457631c96f

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