Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec05ebf24122636…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 14:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e24cea031c7fdbe137df3f4eb05c7ea SHA-1: edacf2e1c58abbf0dca755c976d76d5b2207365b SHA-256: 7ec05ebf24122636fbace0eb952b92ee7b05a48bd6e8f6e662bdf76a0873477e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca97565a4---27979031536.pdf In PDF document text
    • http://ccforum.kr/uploads/file/1630962985.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/guganulomeno.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5514283636.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zesolafubuju.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/24466567006.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/wuvufevajedelibitupag.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/zolinevatumuwanil.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/zopitanesi.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/geravuruzijawowareg.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/piwiziwabajuvuxuxexagu.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/remopibobarupevatax.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/temofulobamusofajelonojix.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/kutezalulilafibam.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/sakoxune.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/27831011438.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/59813575790.pdfIn PDF document text
    • https://sanagustin.cl/files/xiligokiburep.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/pixerekuzibifewusitunu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/24972810159.pdfIn PDF document text
    • http://aromata.ru/upload/files/33831663690.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/45312924389.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/97295005075.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/mogozalebufib.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/dasifonivimelamokegaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=frozen+1+full+movie+with+english+subtitlesPDF 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_off0000b71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71B 16808 bytes
SHA-256: d28f27f3667c628c9f442237e00a6e2767cf466194902586e0bfcc92259d0fe0
font_01_sfnt_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 10980 bytes
SHA-256: 4502df188bf52532158c8540a8aa3214a23adb083d9323a31f4828fb8d21b2e0

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