Malicious PDF — malware analysis report

Static analysis result for SHA-256 47062aa0f6ffc36d…

MALICIOUS

PDF

91.8 KB Created: 2021-09-15 17:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c199c014d9b7d9e78d771efba987f804 SHA-1: 2ac8006f5cfe598285fbd45f667fdca2dc62c1ac SHA-256: 47062aa0f6ffc36d783da2d677f0acd8f045c7d0e7f31810b9d3047c830a4ee6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through the linked PDFs. The file's structure and URL patterns suggest it's part of a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://446888.top/userfiles/file/74112868070.pdf In PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091521482118.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/89853920725.pdfIn PDF document text
    • http://rnralpha.cz/res/file/serimevuzokezuwabi.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vawuxamu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/vafuwisulo.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/foxedonuda.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/vivav.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/73394129499.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/499741797.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/76032480387.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/84720761851.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/43611473483.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/mekodozi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/58d7f413a9e7ab7d4e85120057efdc7f/bamimuwejoziga.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/kenelinimevudipilexumexu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/vopipozafogenadase.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/76496839989.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/69425031820.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/niwukeregowenezobax.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/41100023334.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/97250458000.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305f59cd820---43050836237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+remains+of+the+day+pdf+freePDF 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_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9D 17440 bytes
SHA-256: 643451ce85780a544e9c2243e2dfa735b0e46a48e08adbfc690c893c76e04af0
font_02_sfnt_off000148f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F9 10792 bytes
SHA-256: 007777924b3b058fb91f5f4f54c86ca873533ba4b708ec017fa5ceb95981d1bf