Malicious PDF — malware analysis report

Static analysis result for SHA-256 92105ba85e8ce88a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 02:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24ce37183bf4a840b56511c02e1d0c65 SHA-1: 68aa8f292cbd279a262e7320b7921650945fbc15 SHA-256: 92105ba85e8ce88ae7040091c4f26625f445e3f3e37ba09f234eb3efbb624880
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV and an ML classifier also flagged the file as malicious, specifically as a phishing trojan. The presence of multiple unknown-reputation URLs suggests an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ondebiz.com/userfiles/file/xikanomiboluzuxalamaf.pdf In PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/wuzaropevobalazokad.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/zubovojiseza.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xufewifel.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/18945503038.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/zovife.pdfIn PDF document text
    • http://dd-eng.com/files/files/32641006590.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/medigov.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/83701224439.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/25890849158.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/mipixekokuwuvakev.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210909010945.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/juwusutanoxawomed.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/kekugit.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/93325303923.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/84270690419.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/50374134097.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/1466921257.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351e222df4c---2928120703.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/49043886684.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/68992659660.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/81867780395.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210908045106.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bijofegutomaten.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/xanotodokakikemomev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+games+that+support+keyboard+and+mousePDF 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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 18348 bytes
SHA-256: df05f4de1d6e72bcc7a9f8805dd4257ce10b7ddeb933c68861da32345b60e698
font_02_sfnt_off00012636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 11220 bytes
SHA-256: 305625da39fa6cb18da7fef2793e03b9f23f933493d9ff29f2c01cf9913eca87