Malicious PDF — malware analysis report

Static analysis result for SHA-256 588bc84391fe5b68…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 12:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e85a153acf62b8435db97e0455ed707 SHA-1: 99ca0c97cae8348ed03d251e737cf234bbaae770 SHA-256: 588bc84391fe5b6824b0c7bcc9dc263678751265ed4f11424bb94801c13bf7a9
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially malicious PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/73313925963.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c311342d55---76412276824.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/85275184029.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/fesimogefaxawifakaxidowu.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vamufodedoraxebosefep.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ee32c69f0e4cafabd9189d5f32c8ea61/73066907237.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/zusulemabeziwegol.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/losekabubutido.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94464420148.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/togugirabuxupemerufuv.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pafuxa.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/xosekenowepurosiw.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/48626303741.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/gujekimobananuvexo.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/luwowezixitijurupebewoxu.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/fewupoti.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/nigekulubinirukogesumapal.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/95130595380.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wovibamezadin.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/pepakewi.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/dogajedabi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/86038485580.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/mazos.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/jadazazizofoxegofunupuz.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/bawuvojetupapolakazetiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+16.101+apkPDF 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_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 18004 bytes
SHA-256: 766c170c427de6514a5204ffb489a9fd83d0b9c5adef5fc82e1577585b4db1eb
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 10632 bytes
SHA-256: 89e945c281ebcb5c91be8284dc7eff0295d794976d523416e7315c7c1cabcdb7

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