Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a24f3c7dc845ce…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 06:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f691aa54abbc72d4784496715e17127 SHA-1: 3ea78820426fb86abe21283bbbe6f394775d84a5 SHA-256: a7a24f3c7dc845ce3aa7daa43973dc788ea19b4361d8d8f02b8e0696e18dc25a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external documents, many of which are hosted on potentially disposable domains, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://imreelectric.sk/uploads/file/46241580965.pdf In PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/ragil.pdfIn PDF document text
    • https://theurbanthinktank.com/files/20091146338.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/83980206913.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/35172850921.pdfIn PDF document text
    • http://turatabor.hu/media/kunonodozewofirijupi.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94343295954.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/43172921438.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/12407510725.pdfIn PDF document text
    • http://turnyras.lt/Files/file/judiloguwobojokifivep.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161393d1b21298---62483376374.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/25877530429.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/34982689660.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/puvidodebagigerevuledotil.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/23827456609.pdfIn PDF document text
    • http://gptools.net/userfiles/file/disokopudunulijoluxokok.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/zeniloxevikuvaki.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/5432060006.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/85947699766.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137014d61660---10035938481.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/63525693252.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/vabibuvebejebuximowabenop.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68852392951.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/derudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ice+cream+3+mod+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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 17728 bytes
SHA-256: 1f974c2335d96ad4092f4fcb0145701005b164b9a8dbcd8c9d7fe20c0dd6f0cc
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 10380 bytes
SHA-256: 84f0a7f458118b281bcfbd1e29e453803825dd0e64b2516278e35965267f3e8d