Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd3bfacea8aee62…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 06:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aeece003c5c0f790a1aa2aacce114182 SHA-1: fdfe1196a5d1c2e4087487739d8b426b5896aaff SHA-256: cbd3bfacea8aee62fa0b144a64507fc5d2169127e4a95b2aa552c4fab115cbf1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded action triggers pointing to external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to trick users into clicking a link, likely leading to a phishing page or a second-stage malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • 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 68 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.
  • 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://irlanc.ru/uplcv?utm_term=battlestar+galactica+rules+pdf PDF link annotation
    • http://circolosilverblufitnessclub.eu/userfiles/files/gofusiwozev.pdfIn PDF document text
    • https://sealskinz.ru/files/file/gexuroninogojaj.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219251724109575.pdfIn PDF document text
    • http://xycrusher.com/d/files/gesagugepawezaxixuvilame.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/ruxavexinugavon.pdfIn PDF document text
    • http://dongphat.net/upload/files/somipaj.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/fisejobotopurizaxexen.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/76795550e84b29de4e2a7924f4eee9f7/wegizuraraj.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/ruxonopababiju.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/30225369288.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/wuvidaragozulerawedag.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/73927429965.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/rajojoge.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/28013107456.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/42911605582.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/xeratisaroseporivad.pdfIn PDF document text
    • https://aedwea.com/upload/foto/34457007822.pdfIn PDF document text
    • http://traviet36.com/upload/files/zazelikivosudidorosezuzu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/ziritume.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/binowibimegizamiginisunob.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/56986287859.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/45350411009.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/67100681511.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/zepixasun.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/topidenuda.pdfIn PDF document text
    • https://thepainter.asia/upload/files/26542022572.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_off0000b0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EE 10724 bytes
SHA-256: 4012bd1d55f8298b678fbd3b29cbb0179e8cc58bc7eebfd68202fdccc510ca11
font_01_sfnt_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 14636 bytes
SHA-256: f131f6dc985c8f8b03fc63d918de0824d867e5812a723352e59017ce0720728c
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1