Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0bfca2310908e7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 22:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db69901ba31a1b75da3f89707f370ca2 SHA-1: 2b91b8c2f24d033c657376b32f44cb09f620085e SHA-256: 8e0bfca2310908e78a6c49cac5ace3e2b4dc201e6f7761ea9c0f8dcd0fdf7968
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

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 https://coretry.ru/uplcv?utm_term=download+touchwiz+home+marshmallow PDF link annotation
    • https://calienglish.com/ckfinder/images_store/files/sefifoluniz.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400d2dd6447---nibisaxetafu.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/3617716565.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021917125431.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/zalobodojox.pdfIn PDF document text
    • http://vswet.ru/f/kixud.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/76840662667.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/25918359540.pdfIn PDF document text
    • https://dukupahit.com/contents/files/jerigo.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/rofavumixixanarofo.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/mutabowaki.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/26457322338.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/zizefolunosisajik.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/digaxexamimutu.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/zotarowejovuj.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/85748488794.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/47345266743.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/63947956128.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lafejizotenoxu.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/13272786734.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/lizefitarewototokepa.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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 17524 bytes
SHA-256: 7cf04d74a268722d502d5edcd452c900a8f00eb8667553012edd83a215b2ed67
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 10880 bytes
SHA-256: 3a94926e4df94d98286c2aa6155fc1522c650f36a97dbb7365ae177f3cc51dbe

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