Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8cc756872e626f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 04:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a4255e6c12ed89e482331df5f4164c2 SHA-1: 15e07804bd5c3ac9ccd10679f22fd6c8010ad517 SHA-256: ae8cc756872e626f194ae8f624b2a0a009f29ef416da4492285965386b429a57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving luring users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=how+to+block+a+number+on+my+samsung+galaxy PDF link annotation
    • https://digireg.dk/upload/77491813867.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/33626685908.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/widow.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/74563940626.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mobewakumidinut.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/zitugifaduruloj.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/lizenosiganud.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/30000340837.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/15525605793.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/27193465346.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/xopuxitazudiragelorow.pdfIn PDF document text
    • http://liyangah.com/Upload/file/fubupawipodulotonak.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/tekedapakarofis.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/mudoro.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/xileke.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/mevubexurumul.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/73c39608b228c2e93da05ea9ab9618b1/9803683981.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bofaq1a43geu9vlqk1cqegac91/dabuwejeselivetaniku.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kapusabozifixos.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/43236798531.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/mirufulu.pdfIn PDF document text
    • https://shinaltd.ru/images/file/19739507632.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_off0000c65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65A 11108 bytes
SHA-256: 3959cad82a9965784fc7c3089455a6f8cd705e606978173a4761a403161ea5bb
font_01_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 16936 bytes
SHA-256: c564586e3f4120ffde99fd1e151113098961cbeefb0f26dceec0e839ff3d6bb7

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