Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e3401719ed64b9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 20:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5354ed142d033bc703e1262175511600 SHA-1: a7b4ed4b75dce496b16fd50daf861505fd1fcdda SHA-256: c5e3401719ed64b9b9562b3bd3dbf58101a5e52c7b175389d135e95a3b3fc5ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62549327772.pdf In PDF document text
    • https://ckmusicdesign.nl/userfiles/file/76025062335.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/paxufijafoxo.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/53264742876.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/28204770435.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/69230756635.pdfIn PDF document text
    • http://yanartextil.com/firma/files/sogirazezutelofiwu.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/vujomokuvirafuxo.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/weketubaviwalujem.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/gewix.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zetox.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/6744391020.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/dulasegini.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/41810708621.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/83534793825.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/614a7cec0b801d55dccdb55f853c1f65/fimizowibadaz.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/naluriporof.pdfIn PDF document text
    • http://hidropro.hu/upload/subogijiw.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/50081735403.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/88146734294.pdfIn PDF document text
    • https://mentormedya.com/files/rovavodo.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/xoluwujewozopopiza.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/8966308541.pdfIn PDF document text
    • http://eternaseguros.net/files/files/40775357709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=golf+body+position+at+impactPDF 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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 17776 bytes
SHA-256: 38458124a52a9abc19b203049f4df24f15b357ed9c8d1ef56cf66af1648c3a96
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 10840 bytes
SHA-256: 2814d1cdb62d4c43ef9886647b9488127b04b0696844a38b7f498de7908f5bcd