Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c5310fb631652e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 17:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 495edc26d228d281fcd102a2f1d77245 SHA-1: 01524a8d8700ad96855f034eb6ebd463e1430ac6 SHA-256: e8c5310fb631652e7746d22aaeb247f012ab6742e4d29f5c811d7e7e5155ddb2
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to link farms on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://idominjazz.com/fckeditor/userfiles/image/fomoxamosunononofi.pdf In PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/xewas.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/roguve.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/2782663514.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365edf5a291---sikunisujagove.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613436162b223---5894535530.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pabofawixonemasuw.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/2360244156.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/91972989364.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/mewabobelav.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/73281289486.pdfIn PDF document text
    • http://ahknchem.com/upload/files/wokob.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/dadusikemamafiwamataxot.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906215438330219.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/wejezuwixopovusif.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/31933519656.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/jasax.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60983296652.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/81467057801.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/fonomufojisoga.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/sifikitegesigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cast+android+appPDF 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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 18056 bytes
SHA-256: ddcbff8648c70e7d9392fd7541e44a7c582838775ca658eb4809b508dfc1daef
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 10240 bytes
SHA-256: 9067b1e3104300525ac51ea29773d77066529ec05530d33e1f81cd395fbcd08d
font_02_sfnt_off00012cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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