Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed553e3ab07a60f7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 14:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 63c1c51a709130a5bced1f97e4481942 SHA-1: c9dde0a4059d2d960d8cd6fab1c3eab1481f5378 SHA-256: ed553e3ab07a60f710165c72ab0795eae2d1b080a15702acf81590f82356326a
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://satakantaresort.com/user_img/files/womuzeputugebotewujetox.pdf In PDF document text
    • http://zuche0551.com/upload/file/bapurebojub.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138354abd043---97581056404.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dukowi.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/mugit.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/19647775762.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/99232687828.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/kasoza.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/42120737594.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a31f3680---43314449085.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/97857473780.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/gosulapepita.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/nererenuzabimotufuniju.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/dolunufaze.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/37662515047.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/86986937551.pdfIn PDF document text
    • http://prompol.com/media/file/36602356495.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/jojalikasakafivexemaxuzi.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/29903045108.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/lujojusexux.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/23207917549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+granny+mod+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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 10544 bytes
SHA-256: 82067bf45d8a3956f7b485584609709087b21c4bc5c11aad82b5bb0c3e6dcba1
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 17424 bytes
SHA-256: 9169215ba6c1dcea3daea273f3af0ba276390c925ea30ae7d353f585c2cc5497
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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