Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbaa3be5eae7794…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 14:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1479854089a4d28af14d47c1a437dcca SHA-1: 512a4779b4df07b5e0169388678a549b33e24302 SHA-256: 2bbaa3be5eae7794cb53eeacb701d30ce0a1648871553ba6473eb413ec027932
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the document as a potential attachment (T1566.001) support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=android+app+with+react PDF link annotation
    • http://goksirlambinowice.pl/img/upload/files/lefisokeri.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/6760320579.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/vijemomevumofavo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9bd2plofpjqrk1phqdbsq4o7u5/vifafevutezubiwudag.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/58260110538.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/20941044751.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/28719375862.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/lazot.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/42536489923.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/mosumizuzokinulinuxopilev.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/wupivoluxokosoruvobemam.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/kopeno.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/takenewinupetizu.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/7083128496.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/gadekuba.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/19476918407.pdfIn PDF document text
    • http://debten.net/UserFiles/File/sazaxegizu.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/52527319906.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/20063910237.pdfIn PDF document text
    • http://ccshecea.org/upload/files/surez.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90036344993.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/beziru.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83686fb2f---65067821531.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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10464 bytes
SHA-256: 30221cfd85cc6b1b8e1469b6f7b00417e622ca32e2b32057bb4ea635e4eca20b
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 18056 bytes
SHA-256: 9211e9f08609386588f7bd60ab573b79b76d941f9a370dd589bfc4a264f6f3be

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