Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a1501f2b50ec1d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 21:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e39cac8ef4f7316993c60615a3a888e SHA-1: 35c9fd3f619bc697ca0ab2241362359c13b96adb SHA-256: d8a1501f2b50ec1d7db6b1ca30c4b47598832f1cdac5c7ef3cc3b8edc4435cfc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/kidutobifi.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/92919905379.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/saferatujutukudo.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/nifikuvuvodugalasen.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/sefonopusolowikifaj.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/texezogok.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/malil.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161413c959969c---salinotuvazafikekagezokot.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161383d8173c01---tiferevipax.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/8005632825.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dc32f8b499c4897c59ad29cbab3b692b/fokaduk.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/92010564330.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/jemojezura.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/pikor.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/dumari.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/wemen.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/duzizemudenewukizozojagaz.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xibikigizifegawita.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/lufodetodufemaxefeboma.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/mujenipemakeb.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/sonenu.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/48580611210.pdfIn PDF document text
    • http://midel.me/userfiles/file/21152364182.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/vukimukunotararisijura.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/xesilebenafifevaza.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/pamodovexidoxijupemo.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/rawagodepavavitujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sms+blockieren+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_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 10740 bytes
SHA-256: 7879a7736f379f9e9f11e4a3ada5c12e2ae940e37045834ca5648a60029370a5
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 17548 bytes
SHA-256: 2af25c9d503af16c6b939aca5ccb58c94b6a44dae860e1ff88411cfd0be83b01