Malicious PDF — malware analysis report

Static analysis result for SHA-256 042f8ca0a2f22e02…

MALICIOUS

PDF

76.5 KB Created: 2021-01-25 19:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 338cad80d8ec5c1f036062aa5325aaf0 SHA-1: 671b6419377fa31a45d27e60ca7a9299f30c72c3 SHA-256: 042f8ca0a2f22e02706692b377d9907e8bdd7441e965caa7624756345522dd77
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update. The embedded URL points to a suspicious domain, likely part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://trafficel.ru/aws?utm_term=portable+android+emulator+for+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fcd7b6f4a39f.pdfIn PDF document text
    • http://familyit.pro/zidepemarutajovaloxewipudv7vwj.pdfIn PDF document text
    • http://remontnatali.ru/kovedodonetubilegpmear.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5fda67d2b8ddf.pdfIn PDF document text
    • http://domastmsk.space/app_recarga_certa_para_que_serveycef0.pdfIn PDF document text
    • http://dunizajo.66ghz.com/squatting_form_feet.pdfIn PDF document text
    • http://mazers.fun/flappy_ducks_deeeep._io2dxbp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gateme/28472409442.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/zoology_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/gukewuw.pdfIn PDF document text
    • http://kefujaforu.rf.gd/22476501901.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/dentsply_cavitron_insert_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/nunegopudamiseromepiwab.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/mexenikiradoleza.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/biosense_webster_carto_3.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/99193836853.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/7056833342.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 5480 bytes
SHA-256: e21e3cdb54ace7ca3a65f045ae21b05826f33955686552dada56f83330d79497
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 10980 bytes
SHA-256: 9298f5049dc6a431fa87db000722e1e29518129c3e6b5c00cd3ad019370b4933

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