Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f167535452cceb2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 00:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8040384d558ed037d094d52f708d1bc3 SHA-1: b2d58947cdd4be4852acab9066e86aa1da036360 SHA-256: 8f167535452cceb2b2eae83bc3042950a239ccc23daf51bd7da373137c562616
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded script, which in turn would lead to further malicious activity. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 http://tnmetalworks.com/images/files/42122374400.pdf In PDF document text
    • https://pannonfinanz.eu/editor_up/24864656670.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41acd3981---46708654050.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/64095138095.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/gafuxik.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/lufirasebegi.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902075811.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/67212896497.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/69559500165.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/1776663547.pdfIn PDF document text
    • https://architektor.ru/uploads/file/romowevu.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/lotidux.pdfIn PDF document text
    • http://standardamulet.com/files/files/vogegododijapap.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109162009367487.pdfIn PDF document text
    • http://metallpress.ru/files/211344394.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/74166505113.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/witodoliridunamenum.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/miwopel.pdfIn PDF document text
    • https://hoavily.com/uploads/files/lejuvevitazome.pdfIn PDF document text
    • https://kokomanis.com/contents/files/rixafebawolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+block+inappropriate+websites+on+android+without+appPDF 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_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 17088 bytes
SHA-256: 0af1353a26f8c78225d218e568b3630f6b86704edeccc89e309d8e408fee5041
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 11020 bytes
SHA-256: 5e34c9285c91e3a91dc3e46fdc6ac7e749fe931ac011a0a8095b57dea54e9832

Open this report in the interactive analyzer, or submit your own file for analysis.