Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bc1115d09eeb91…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 10:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b19b218a3e0b3de2e9458b62da7eaae SHA-1: 53ed657f3c130015e34a5922a409b4d7dd1877ec SHA-256: a9bc1115d09eeb9169a126332c6e87660c5e81f72fbb95ee02857da2c8a57f4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs pointing to other PDF files hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly indicate a malicious intent to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sinorarechem.com/upload/files/kerumetusodaz.pdf In PDF document text
    • http://skpizzasubs.com/uploads/files/podigapasuvubad.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/memiposeporozujogotul.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/rutotakatexixumujoparara.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/10724123685.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/muvukakanegurilezi.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/96174597294.pdfIn PDF document text
    • http://ministerium.pt/files/tubusadasasedan.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/nizatupa.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/juzilolodapowe.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/fivogokidotimijiza.pdfIn PDF document text
    • http://mobiliteit.nu/files/29143495542.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/5657434849.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132934d70f38---kagujibojabowebipeliluges.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4ma0rukk4lcbp5fe6fkgi87h36/kesajotekapa.pdfIn PDF document text
    • http://wohingltd.com/userfiles/ripuwixigefugit.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/53200524474.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/kipajobin.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/molirironilunibipenivudin.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/wufuxif.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tezofonijivaxajida.pdfIn PDF document text
    • https://steammining.com/userfiles/file/55642586679.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/gomej.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/pobenebuw.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/rawipejus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=voice+translator+pro+apkPDF 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_off0000c844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 10428 bytes
SHA-256: 4eef335e6f4dc3cfa87ba218f95a5ed74cac7085f26a61c838529556c3655de2
font_02_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 19300 bytes
SHA-256: 7010db9d5a0648217c9d5ff26651a4f3a5d209bb69bb55deae12756c547d7014

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