Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec7a3b04a90c32d…

MALICIOUS

PDF

95.7 KB Created: 2021-09-12 02:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c419557e143393c1723eb0ce524d39f SHA-1: 23dfda63b19ba82150fcc6355dbd2c0a615f4828 SHA-256: 2ec7a3b04a90c32d558a54b757f8615f621ae1bdfe0c91609e74249be4d21f8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or link-farming campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://vinag7furniture.com/app/webroot/files/editor_upload/files/48288947709.pdf In PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/lanusenuratolopidufaki.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/69825059408.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/novojadufuziwilamigu.pdfIn PDF document text
    • http://rafaelokazakov.com/file/dokakefejomeje.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/53633031319.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/burunab.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/dawipefijuv.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905045710226.pdfIn PDF document text
    • http://topas.lt/userfiles/file/bobiwu.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/loxijaterepobogagijomop.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/87047013800.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/xexevuzaz.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/62430602833.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/64763015072.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa65266d81---76743938706.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/11441496964.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/firekugesonodadaxenipakow.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/59197901068.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/25966937717.pdfIn PDF document text
    • http://hmed.vn/upload/files/55416917151.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sikeniwum.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/zepajadajotikifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chromecast+web+browser+androidPDF 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_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 10844 bytes
SHA-256: a06c535e6a42d65d7ca32c1f2950a81c0f4dc638977b7514646ba59b01bcae67
font_02_sfnt_off00013d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D64 19660 bytes
SHA-256: 22e3904bdb291633b4b52e8e176af36ef77da95b9c1e99da5b56a92a1c85dad5

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