Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdba646c35882cd5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 02:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7222601489a1c9bc751d1e6e093497fb SHA-1: 22f08f84b5a1845dd42d2601ede4d07c0f030383 SHA-256: cdba646c35882cd51edbf9986879a284b726dbf753e60c6c267779d4f472ee85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and a 'link farm' heuristic suggests the document's primary purpose is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=geofencing+android+example PDF link annotation
    • http://daugiavanthienphuoc.com/media/ftp/file/wotamopalonut.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dofux.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/zodaf.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/77406754134.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8361402c6---bumuvufamoreposiwerak.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210915145223.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/8020428457.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/mexakasanuxazibuxa.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/bosasotogitawumemoxerepu.pdfIn PDF document text
    • http://ewtch.com/upload/files/magikuj.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/72187990863.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bikilipelukogowizexaduvup.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/81620965819.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/tetazuvatoraxuginik.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/vipojexudeliguvalaxeme.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/19427716085.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/varawezifewalefet.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/89618675140.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d4b1deccd7028bd72596db441d354350/fodomumemixab.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/99597305842.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/9394475146.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/perabevokagozoxuzobezub.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/pegaxuvasodole.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/mokelobaramuperavafotebep.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/37309754265.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/58089141895.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_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 10836 bytes
SHA-256: fecd7bdd9622d3ec6b514d762a35238e97bd25e78b4378dbf9f51606b67dc1eb
font_02_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 16508 bytes
SHA-256: b6da6781cf9413f3f43588e073b0a68e354f3dc4d41faf50cd99fb8806fba0ee