Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5718e92871589db…

MALICIOUS

PDF

90.3 KB Created: 2021-09-13 06:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 322952b272c1f950979c45b6c5913962 SHA-1: 0d44f5bc90ff36c4fe4d18b7ac6c3a73d9a0645d SHA-256: c5718e92871589db1f7d8459f2c5c59c2c050d392d203563a87009f919c064ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files on potentially disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://waycreon.net/bhaskar/yii/upload/files/mimatolazibope.pdf In PDF document text
    • http://matraholding.hu/images/userfiles/files/51888412685.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/maboneso.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/59949782687.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/37296468032.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/bubisi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fasaxufenazusunoxefekera.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/25284324618.pdfIn PDF document text
    • https://premiersuli.hu/files/files/telifunuxeled.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/50222132387.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ff7dfcf0e89e42b2db99da741c342189/7643585907.pdfIn PDF document text
    • http://glassick.com/userfiles/file/woxavobajerasa.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/87986029029.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135337d01953---livogopezanojogulupan.pdfIn PDF document text
    • http://texmet.pl/userimages/file/43798559928.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/kewutifawosakomirasu.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/jalufenidojimenujodowu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/47952231948.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/vosezijinani.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912205752511031.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/rujur.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/sajuxagivizazetesutofeti.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17418170479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+movie+hd+bollywood+downloadPDF 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_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10872 bytes
SHA-256: 2900dc7ca576f5fe927dd4850a193f99d556f0225319c18f536423fb7320226e
font_01_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 17928 bytes
SHA-256: 08ef2e4d5477038e42c9b3da0afad0b25c896dc6d229d0823b2825412aa09399