Malicious PDF — malware analysis report

Static analysis result for SHA-256 79be3b2480407da9…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 17:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b9362eb9b7630be7b6dc4a40819069f SHA-1: df5465443170062a7b900d1a7d13487886595669 SHA-256: 79be3b2480407da96078531a1a1c5114a52d6a247002eaa4083d3fc16c596244
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains a large number of links to potentially disposable hosting sites, suggesting a link farm used for distributing malicious content or phishing. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://rachelrom.com/rescontent/file/rixewotagiduxi.pdf In PDF document text
    • https://tskrea.com/userfiles/file/riduk.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/58356478897.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/kusakutisi.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51115983705.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a52f40e0e---veratuda.pdfIn PDF document text
    • https://ubranni.com/uploader/files/bekukolovitaveviw.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/goxirepunu.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/pugofetuguv.pdfIn PDF document text
    • https://tcremich.lu/files/files/vofomejagafunujukem.pdfIn PDF document text
    • http://manu-transport.com/documents/file/vajubedegiwivodesegul.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/81689064998.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/70591010837.pdfIn PDF document text
    • http://tcihk.com/userfiles/61550092120.pdfIn PDF document text
    • https://renewone.de/files/77419611148.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/41200492018.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/54502356563.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/52962535193.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/83143538212.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/revetunekonaxupusorufev.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/90994271614.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4fd5ce94b1a1baac65a029471d629fe3/memepiliwudo.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/50518788004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+minecraft+pocket+edition+1.11PDF 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_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 10912 bytes
SHA-256: b8774f76b29ff5a34f283847b8d051a1a1cda2d8709bfc94d5a720e90cc6c1f7
font_02_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 17364 bytes
SHA-256: 39329b396a18194a2bfe9f0633f5fcc349f73598726f027be31289eeb1efa6f0

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