Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fec629dccb0cb5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 14:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11cbc4e9f180932251520fb44751fff5 SHA-1: a2c458b6b06a6a4079a908a081521778ce9a1af4 SHA-256: d4fec629dccb0cb58706e25cab2066dfde6173fc8c54e80b4818c657b85d6a4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and presents itself as an image-based lure, a common technique for phishing. It also acts as a link farm, redirecting users to numerous external URLs, likely to facilitate further malicious activity such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://huntic.ru/uplcv?utm_term=123+go+watch+movies PDF link annotation
    • https://bdlvn.com/steel/upload/files/juzukilenuzewu.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/81735096589.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/jigamarinivipogowiz.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/80096218931.pdfIn PDF document text
    • http://melabo.com/upload/files/33914427440.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/95745325587.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/54197936918.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/68cbb47b907d12958efb12a445a7552e/25374167852.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/numezulufuredov.pdfIn PDF document text
    • http://cga82.com/admin/File/88407209158.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9e9d114d---98375476276.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/lupofuxi.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/pobesabeniguxozajagazo.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908174425121.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/54908183914.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/jususatexadarojex.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/52629649370.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/328465782.pdfIn PDF document text
    • https://olterus.info/contents/files/xotonimozibi.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebuz.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/10710896914.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/disarakamimowiwenamevuv.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/vojararutu.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/52148153603.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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 14356 bytes
SHA-256: ac7191c4d7e9045d1f36b27b62eba69287e8890633843e1e8940b6e2f28c78d3
font_01_sfnt_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 10824 bytes
SHA-256: a901eee52ba9d2df1e6ccf78940e82b39d05bdeec66dad84fe190f7b12e98f94