Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01e9f49efb7d487…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 20:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b041f6113aeeed2cf7edd565e247ad95 SHA-1: 5d1028518fef21b0d16c25563daf58668858e3ee SHA-256: a01e9f49efb7d4879f9f428cd778616e3ecf86250b0fe931da6c874401e12bde
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded links point towards an attempt to direct users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://canshu.dlzj.net/upload/files/20210903233146636512.pdf In PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/xujakawiluguwogup.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nopazisobanajisagubajeg.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/sotelotob.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9f11df5a---fegeluwosevifugezejeje.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/15108506939.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/62086040791.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/52153585555.pdfIn PDF document text
    • http://vlajamo.cz/images/file/nilumuxujuwaf.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/65356577051.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/058e0c2ca3b018186c1426f35ea5bc9c/befuvek.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/terenigel.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/17232372475.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/wivumevorikebufojonijugas.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kutap.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/pasuvuxavemino.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/49274083015.pdfIn PDF document text
    • https://gangnampools.com/contents/files/dituximop.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/zojodapivilevarosanono.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/67832731365.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/bamomovusi.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/jedivilawulagusutux.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/42392294752.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/57739854493.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/16519408620.pdfIn PDF document text
    • http://domosplast.hu/files/file/valapipox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bubble+shooter+snakePDF 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_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 18200 bytes
SHA-256: bbc23266d7da9a03b0249396bb194b6adf1577dcde03cec94cc77a33becef43a
font_02_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 10496 bytes
SHA-256: 9c0eeda4951b20f53642a42071c29072f93b3eb9afdd8f1f95956b645fb83617