Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e41728d922b1483…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 16:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c3fa49d33d62e35ba67a663d77bb7ec SHA-1: 65673fb28de36f3280ef3ce98fa1443d5fffced0 SHA-256: 2e41728d922b1483a560de01029eed74dddaf8fe26ab1009cd215d3567a75090
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm across many domains, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts strongly support this. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/24832004865.pdf In PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/xobujowidofolol.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/5518775643.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuruzomitakulugede.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/63137639914.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/lujojusexux.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/19078410900.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/kefunu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/lajikasokudekuluv.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/97560480744.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d82bc9225---33550825064.pdfIn PDF document text
    • https://abss.pt/userfiles/file/25674597065.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/77745647910.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee0516b1b---12493542808.pdfIn PDF document text
    • http://ymmicro.com/files/files/sabelibasozurejusagujev.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/dofixusizibuzujo.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/13395489398.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/839020739.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210906230837.pdfIn PDF document text
    • http://bushurov.ru/images/files/rugunefezaxowutunadi.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/zipatofi.pdfIn PDF document text
    • http://onlinevay.com/upload/files/jiguvivokeboboxisigamu.pdfIn PDF document text
    • http://www.centralperdana.com/file/nujuzafiwofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=water+bottle+flip+game+unblockedPDF 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_off0000c218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC218 11120 bytes
SHA-256: 1de35871a8938ba329b37b3e14ca4f4ded1cca270a659aa794fb4f948cf390d2
font_01_sfnt_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 16128 bytes
SHA-256: b11b941605186456cdbfcc81a196fb6b05b4bc569e6a1b34e3f886192a5820fa