Malicious PDF — malware analysis report

Static analysis result for SHA-256 7627d6b1a9f94e02…

MALICIOUS

PDF

81.5 KB Created: 2021-10-04 16:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 915c88632c3e2f4f96f180bccb838498 SHA-1: a1dfba1aaeb9d570535581f60e2190ea5cbe7bcb SHA-256: 7627d6b1a9f94e0288465880339434f2d9b1e1a582fed7042b21820eb6515308
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a high concentration of links on disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://atut-biuro.com/uploaded/file/26228365297.pdf In PDF document text
    • http://agrion.org/upload/fichier/88821834821.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/16459674926.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/21161521776.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/61365577589.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/91236118196.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/24753459236.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091022290673499.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/mames.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/26047553416.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210903040501.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bekupezetorepimugamu.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/27599362108.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/j0qo9ggb4tjsvlsdkg0q6grud4/bijegojax.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/lefamu.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/xizabixavesazixuzuxobubo.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021100305202015.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf60b7f966---96183124911.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/temunalojuniwubovewo.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/19152020244.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/52817074245.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/84340951769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=table+2+to+30+chartPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/mitufazuji.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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 18308 bytes
SHA-256: adee489f1dee51652c9f4e8b205ada6b9c02aab7483039bfa3474042c70cdbb7
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 10480 bytes
SHA-256: 0c511f2b7613f38ef64fe6fdf2644c353c3806d499dc20c584e94fae47e4740d

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