Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1b4c79fd9176f3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 06:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 286e2eca4ae0f9b3aa913f6b1d2ac8c4 SHA-1: 5f85665411609426e12fe01aadebf877b249c3b0 SHA-256: 8d1b4c79fd9176f3929c41ecfddb28aeb1bfb8e2077e22a3b1236c711126aa3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or content-luring 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 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=wonder+woman+online+free PDF link annotation
    • http://bukharageorgia.com/sites/default/files/file/pemim.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/59224379387.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/37216443034.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137362119952---rigunomejata.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/povadirotev.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/20334535765.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210902101510.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/33884552307.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/62810450239.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/givaxosujesapufut.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/pasutufapuguxe.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/bomuvurebol.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/76975832905.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/30130508091.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/texajuda.pdfIn PDF document text
    • http://wawa757.com/uploads/files/21926040159.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vutanaxuworumiwaj.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/jubogugijatekixik.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/41220168867.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/60077117951.pdfIn PDF document text
    • http://orderkai.com/uploads/files/12331132709.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/67693228421.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/gefarov.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_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 10328 bytes
SHA-256: 1f7accee80afee135de1680c9d80754cdeaa06be77730c6a71a96ca80c21268c
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 17688 bytes
SHA-256: 1318f2995be54deff602619bc7446af90d87c96d006ef85272f030e73f48dba5

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