Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b289d1127f6e3c…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 21:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ba9b4208fb4354fa25b457e73d50f0c SHA-1: c308fbac1d969edc2201c5ff66a6bad0f3507f62 SHA-256: 19b289d1127f6e3c63927d13fda8f44983873ebe12cc70d63533afc5c3b1284d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely to obscure malicious destinations. The embedded JavaScript is likely responsible for redirecting the user to one of these malicious URLs.

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 https://allytemp.ru/uplcv?utm_term=redmi+note+9+pro+password+unlock
    • https://vr-spagna-20.effievirtual.com/galeria/files/20622893858.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/dedeg.pdf
    • http://519pf.com/userfiles/files/77274659956.pdf
    • http://art-lan.ru/uploads/assets/file/76982357693.pdf
    • http://abwplazaview.com/uploads/files/pelofedimitexafufoli.pdf
    • http://onfireinteriors.com/userfiles/1823720982.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210907_378B542C3D0DC630.pdf
    • http://meimagedance.tw/ufiles/files/83100376277.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/xuwupijowajojaxoduvo.pdf
    • http://mackyz7automotive.com/js/upload/files/17610057863.pdf
    • http://fixafilm.se/userfiles/file/xutamexekipupugul.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210906024610.pdf
    • http://educaholistica.com/resources/img/imagesck/files/punakusijex.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/84784022363.pdf
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/25922138055.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ee0d6deba9515d38853d693af26c4399/12476462041.pdf
    • https://dom-titan.rs/files/tunezivexuxeditovodip.pdf
    • http://mfcpavpos.ru/file/53648985742.pdf
    • http://dsagco.com/Upload/file/26191790717.pdf
    • http://getvisa.ru/images/File/39984741888.pdf
    • https://al-wesam.com/userfiles/files/11199359456.pdf
    • http://quiltingacademy.net/fckeditor/userfiles/file/metiboninuwezen.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210904_77844A33A10A7696.pdf
    • http://kutyasturak.hu/images/files/73146384326.pdf
    • https://magicdiscoradio.hu/userfiles/file/32756613722.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 16792 bytes
font_01_sfnt_off0000e77c.bin
ea78a5771c618b950a1ab538306e1e8015f7eb6ce4fe62a801c70ed10abc710b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 17844 bytes
font_02_sfnt_off00011613.bin
ec6bc182d2115a63fa3d1a1213c90f479d2630ace836b320cf96b30996404104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 11168 bytes

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