Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d30aed56d6d5267…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 16:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b347ed8da5290fdeefac64d492ad7d2 SHA-1: 87fcebeaaba08a80cab03c26f61255fccb0f385e SHA-256: 8d30aed56d6d5267c06e11679cd2e40d2d7abc49d336e1b2c453267915b146b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, with one pointing to a PDF hosted on a disposable domain, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiofagiani.eu/userfiles/files/revuritobiruvifakipimi.pdf In PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/71455068049.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/94236362ae2514a5c8bea5ce32cf8848/72074513091.pdfIn PDF document text
    • http://splogservice.ru/content/files/45397282439.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/jinulebivakixusa.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/14315641483.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632913775_188049c534.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/nizobofodex.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/87369443584.pdfIn PDF document text
    • http://signauction.net/userfiles/file/31019153738.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/33684019292.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2fed02a17---70112495508.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109020857013787.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/molufevikil.pdfIn PDF document text
    • http://fxlcd.com/upload/file/10358388356.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wokozomipasodifu.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_14_15_17_29_6674.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/93884834476.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/97094916679.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/46321693074.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/10816430950.pdfIn PDF document text
    • https://etadelloro.it/images/file/tunogegojuvozax.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/toguremaverovozanasuku.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/68272728100.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6624361a9---52450831870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mod+game+storePDF 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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 10344 bytes
SHA-256: d3c4d6ecfbc25eb3b6de312f4d8c8a939d46155f19d8b2e1093018f199fd053e
font_01_sfnt_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 14996 bytes
SHA-256: e70102a40be504333b69e2399eceb648746948140491850c90fbc34e2b3d6e30
font_02_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1