Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cfa68004e9edc0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 10:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2647a253605ab0754ed907d986ee1981 SHA-1: 2b3d15e140b78284f2db0e79a4e19641f65024a6 SHA-256: 86cfa68004e9edc0d4682a1a7cf6b906f528cf41fe3ccbb384e078e490db1cdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many of which point to disposable domains, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bartonsteel.com/tony/barton/ckfinder/userfiles/files/guradidaxanesowine.pdf In PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/97212272774.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/tosuvemegiserag.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/34370398715.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/muxomupiminajuguvel.pdfIn PDF document text
    • https://gdaniec.com/upload/files/lexujokuvaxip.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/10725992861.pdfIn PDF document text
    • http://spharma.ua/files/file/penuluwikonatutome.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/54069271193.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/78284732680.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/vimobogudojor.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136db1d98e52---41773567756.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/83082751964.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/fixawopub.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/milapirufipudi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8c8900e47fe310d59639c2e208f2be92/xukudisozowanakivifawatix.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/ginizidiruwopuxilegal.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/2606353318.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mukuzugowudulafutazixu.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/36525442995.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/38777799787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tasha+cobbs+put+a+praise+on+it+lyricsPDF 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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 18104 bytes
SHA-256: bf3701be1d9455941e2e23fd4509ac878715a57d7ed8347414541cd9b191599c
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 10788 bytes
SHA-256: a43262677e64ddefc409f725aade399dda80f5e57a4e9f7e6cdc0c793ef11d09