Malicious PDF — malware analysis report

Static analysis result for SHA-256 5072f8190bcfff93…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 07:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63d561e269548564a6aaaea071900353 SHA-1: e4aaaa6913da5795c2ee0b5a94898f2af0d9708a SHA-256: 5072f8190bcfff933ad3e36fcc814ee8c92f595f3a287fc0d2d69985076a6eed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are associated with file uploads. The presence of 'utm_term' parameters in some URLs suggests a phishing or tracking intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.kigimex.com.vn/ckfinder/userfiles/files/7976099676.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bee4a0f14---bifab.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/41443326469.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/15502371334.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/56295829386.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/290a36e554c6d4ccd529814e3a1c9e94/89386783547.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/6465248694.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/dumuzetepodakilirenunu.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/logeje.pdfIn PDF document text
    • http://lobi.md/userfiles/file/pemanumakomexofitexab.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/54862872549.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/43119960526.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/wamotabekujesututisusu.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/latebafajojusepanikirevup.pdfIn PDF document text
    • http://abwessex.com/uploads/files/27500084574.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/67048675504.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/72783686966.pdfIn PDF document text
    • http://rinsacars.com/files/others/41818479975.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/23854950420.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/sorevo.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/32681609036.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/nivivoresogijes.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/23762009798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=air+control+apkPDF 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_off0000c749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10140 bytes
SHA-256: f90f51f7e37f47b40e5cc50b86d2706cb37edaf31dd2a7faffdc8f3887111a4b
font_02_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 20848 bytes
SHA-256: d845bcdd6de05a2d323370721af93f827d1d7d3e17410b1a9b59f572087972ea