Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10c16cb966786f2…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 18:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f02f6eba313f0447702d22101589b7a5 SHA-1: e74d8f3cc747dd692d154fe9587f0058da649240 SHA-256: e10c16cb966786f22e6631ff853bbc9ac7f8eba8ec879f55b373888048d471b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sausalito.com/wysiwygfiles/file/7580444681.pdf In PDF document text
    • http://www.bandungmesin.com/file/wozawazelenufa.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sekekupowukoxupadu.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/feziwipalawuzodufofa.pdfIn PDF document text
    • https://kawanmto.info/contents/files/luluwudifavogidineforuli.pdfIn PDF document text
    • http://briztravel.com/upload/files/60058120682.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/winonuvix.pdfIn PDF document text
    • http://klhl.com/userfiles/file/fenudujumamonogixeduvorum.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/duberexovimurizixira.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/21427364009.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210911205551.pdfIn PDF document text
    • http://skncn.com/u/files/vukol.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/zavorodowovuwer.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/zawitogixazimaje.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/94518910639.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/75607825361.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivasizolazofevurug.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/milaxu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d35b58fc5---40385828374.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/gixamoxifirifiwuzef.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/xuboxir.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/bufomikuzubaduzuzopoguv.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/jimekusini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=spider+man+3+game+mobilePDF 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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 17688 bytes
SHA-256: 006b5239211f804f2bb79e445db376d0d9b822cd788182ad2ef514f988d0b474
font_02_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 10856 bytes
SHA-256: fe8d9c46931a284c4bf6df17cf7574d21c9319176af288e9b3b44679410677f8

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