Malicious PDF — malware analysis report

Static analysis result for SHA-256 d764436f3487b016…

MALICIOUS

PDF

71.9 KB Created: 2021-09-12 09:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0a66f2c6c68fcc0923f62e86ee9a5ec SHA-1: 834f3559e2a37ce0ff0180d8bfe52458da9a5c1c SHA-256: d764436f3487b016013103ff8b4a8666756e7dcf67b10c0b15df1c3466059b88
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and heuristic firings indicate it is designed to exploit vulnerabilities or trick users into visiting these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dayou.tw/uploadpic/files/202109121306373552.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/as91ogh656v458oem20bic6pp6/tejamesojenoxokix.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/sepili.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_7ED5EA0C8D45A6BF.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0ojt9qrgi5334mb5egj7ij190d/23990064246.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/witiliz.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/99787611587.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/11078385300.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/sawogije.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/26513029305.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/6253075091.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/14275952981.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/33312760253.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/11376503235.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/63871016535.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/lixigejedividukujonaro.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/91011008742.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/sajalasenitexejewozuku.pdfIn PDF document text
    • https://led7.ru/file/58482116203.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/99152467392.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/92261993358.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_7C1D1515413EA239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=peter+rabbit+full+movie+tamilPDF 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_off0000b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB515 10408 bytes
SHA-256: fe8f0d742d19c7acafa1d480fb166817dc7d216af374af9e4ecb76b374a57a02
font_01_sfnt_off0000ccae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 17564 bytes
SHA-256: 42c1666d4cecbaa1bab605e69aa74b94d1ae23dd3ed07299faec6a3e1c18db49
font_02_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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