Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c25b32d7ef0c94b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 09:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 695699dc89dbc530dda86560354e9df6 SHA-1: 083020e0697442863813b1ed1f656c7e57a8c262 SHA-256: 2c25b32d7ef0c94bad91301891b998eacb39a61a923ec237d97051db3b0036d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=best+emulator+to+play+mobile+games+on+pc PDF link annotation
    • http://hongpakthai.com/ckfinder/userfiles/files/60505830876.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/97097003819.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/34691353478.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210907_CA9B7CD4102A6611.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/gaxopanupomokexoli.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/jibotugixudataxu.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/79288225982.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/fatabumomalopikazu.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210911092424.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/15973853221.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/93834936425.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vebonabuxagaravikalazi.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/85527321600.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/podalojajawun.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/puselobufakutafotapuda.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/bumidoditapefazamo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3e0741fb---benaxu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904055524.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/kuxowabejitivaxu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aspl40irk13ntnkevt6qf33k6c/43617223173.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/90207120169.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/66993237925.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904022519653.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/95928515382.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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 17892 bytes
SHA-256: cf08299e9618c5dbe1d234c6de8b88be5c97d1b6ec40aaf6b6e0f66f74b8c576
font_02_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 11124 bytes
SHA-256: dc4a372ef9aadc9aa667c695fefa384b5a89c706ac29e491c1143d0f1468f645