Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5b86e3c62bade1…

MALICIOUS

PDF

93.5 KB Created: 2021-09-14 06:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 524b2558a2e93328b82a4d076930c55f SHA-1: 029fdf5d2a2af9bb16e1e7f3cf860113f2d34dcb SHA-256: 9d5b86e3c62bade176e9aae3bf3c8f48b579a1f7d6fc46ea87fc9ef6264ce682
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a high number of external links pointing to disposable domains, suggesting a link farm or phishing campaign. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://garglob.ru/uplcv?utm_term=free+fire+2016+apk PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m43s3bfrm8pm4b9h88cd3979d4/33421405998.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/26309980414.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/90815713680.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210906_060311.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/81329938849.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/laxefikuzajasuka.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83556416948.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/goverolobeba.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/99584137676.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/85907092331.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/19874557202.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/83492105885.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/26986682069.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/42511267766.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e18fd00ff---papizuwezexabolusidaxam.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109131147494069.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/120933236168.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/87554492697.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/walilidudomidizu.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/wofegimoj.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/kuseberabexigitinile.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/35052821157.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/67353931206.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/97471554434.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/52489530598.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_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 19144 bytes
SHA-256: 6c607729a567b8a4641134a7f256bf238e1e388ecaf77b39a2b30895c57f1d0b
font_01_sfnt_off0001388e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A5 10348 bytes
SHA-256: 666b70c3225ce1f2fab0958bf56fd26de2ce337f6766ee4f8d8aed548e908970