Malicious PDF — malware analysis report

Static analysis result for SHA-256 703d2e40afde78cc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 19:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf2a171909ab1b67877a258dc5665e4e SHA-1: 164a2287df20ea6650f87d16d456f73da45544d5 SHA-256: 703d2e40afde78cc58c761281be30ba67938e27195a803a9c18f53d67b9a36f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate this JavaScript is used to redirect to external URLs, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript being the primary mechanism for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://biosite.ru/images/news/file/51601307319.pdf In PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/17120536761.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/zewugoz.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/63345388004.pdfIn PDF document text
    • https://chptravel.ir/data/file/wifegamulopofu.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/12707334123.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/mofipulopuda.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/18351522719.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/xalitatikemexevuto.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/21775700244.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631421322.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30bc5ad2a---3387140491.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-14/20210914084834422320.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/94219683628.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/goforelo.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/92177994942.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/40961477567.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zulalip.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/9549710502.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/82038463996.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/52008327616.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gaxopekisijixuvijijaroj.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/pasopaxex.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/93382677613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=investments+bodie+kane+marcus+pdf+11th+editionPDF 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_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 11240 bytes
SHA-256: 835f7038ceb760b9611b3f2be20c8b898f99ae73587a64e099ced5d4e104b0e4
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 18832 bytes
SHA-256: a440bd007a55f7c360ef2b385d5231a8d735519cc073ac015d87175b2d6a9f2e
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1