Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1dd97667764a19…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 03:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0ed4beddd170ea557540a90dbe7e8f2 SHA-1: d96f3d3d71909bae3a4c000ac0c9a5e08af1fdf2 SHA-256: 1e1dd97667764a19038cd3de21977076b312276aea627d9ab390f87688dc3025
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing or malware payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=pubg+korean+download+for+android PDF link annotation
    • https://spvi.cn/filespath/files/20210901192903.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/videla.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109040648035248.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/50976143921.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/gilipepuk.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///rovizaxugusatoxananipolum.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/87488728290.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/tetozebu.pdfIn PDF document text
    • http://prosquash.by/data/duwuzimomojuzim.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/sokemajiruxodezekedodesiv.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_5449CD32985E3890.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/91427156737.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/vutomogagako.pdfIn PDF document text
    • http://le383.com/uploads/files/witopu.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/2201388594.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/rivolebonesuve.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/51300253016.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/mapevodarimiwabitu.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/rewamewumusumonusukuburoz.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/84308448689.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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 18332 bytes
SHA-256: f6a44857e4696811bda9050ce5d7aa76621674789d753535e799881306e9132a
font_01_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 10680 bytes
SHA-256: ff3cac54dcb47fbffe3a726bc366634fbd30eb387ce7b32cca88d166ff73a98d

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