Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2427036913447fe…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 11:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc06977748969dcc9917d69b6510ca7e SHA-1: f676ef794d10992c847f016d2cd13910c60ffafa SHA-256: e2427036913447fefde0966208e72ae3ef4d5fd0cdee3f32fca02ef613722f85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful sites. The presence of multiple external URIs and the link farm heuristic strongly indicate a phishing or malware distribution vector.

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 http://www.afurg.com.br/assets/ckfinder/userfiles/files/43520483743.pdf In PDF document text
    • http://emeat.ru/var/files/vugodumizikutugujeg.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/30215487022.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/30840583808.pdfIn PDF document text
    • http://orderkai.com/uploads/files/wowujamovikepitafo.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/sogavivofajapufiz.pdfIn PDF document text
    • http://esteel.my/userfiles/file/41663898660.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/38948335745.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22685394867.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/64721494433.pdfIn PDF document text
    • http://sungder.com/upload/rikudatetubowed.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452a2b5f74a---54994032612.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/33896618611.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/sozimuzepapisagasanafolip.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/botenutadixaxora.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/9224127366.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/90074062558.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/18352747801.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/sinesek.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/bewobozetuxajurebiz.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/tejixajugeka.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/dexuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=words+that+start+with+y+positivePDF 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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 17852 bytes
SHA-256: 9cddb5360f272ea5f53381914dfc1f89162af784b76ec165b466d8cd97589ab2
font_01_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B56 10600 bytes
SHA-256: 4e093f26a845de07b82b885cc436d7b23d91d1740e263ce63732063be02aa047

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