Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffe5c09ee107584…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 17:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd1c77e0f7631017a6a4c6169dd7972b SHA-1: ea60fc5d113df233bea108d7c71b70828375d6f4 SHA-256: fffe5c09ee1075847b4b4335f3d3fdb7f9b20bdaf8c0814bd6939f0aecc2d80f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or SEO spamming campaign. The ClamAV detection and ML classifier further indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the structure suggests a potential for JavaScript exploitation if present in other parts of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://groupunsur2.com/contents/files/37653646810.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l2etloe6eo6670dsnni18prb9d/52497974204.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/29247974504.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0d16d9c88e58add6a777ed43baa5be04/44760515151.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/sanolarugavemol.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/46761562577.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/20412413104.pdfIn PDF document text
    • http://emaaravm.net/upload/files/12435290126.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/lenovaviko.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16132563618fbe---rakijevepu.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/53923038761.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/rutoporolejefeboj.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/mexesagagifenamimomavuv.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/67969796585.pdfIn PDF document text
    • http://393citizen.com/upload/files/rofozubemav.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/64876722438.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/notedades.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/43599122563.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/lafimifizotevo.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/jazevuxuvugobiko.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/68794643578.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/divafulinewuwej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=damon+ps2+pro+emulator+for+androidPDF 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_off0000c0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 10880 bytes
SHA-256: b916ce7a5f0d6776802009d1ed489ac412124e510d29e292b12e55ddce0aa93a
font_02_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16084 bytes
SHA-256: ae8393eab86e5fc3c3d76b8414975039fad252298612ab5aef959805e42a20e9

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