Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c595113370d4ea…

MALICIOUS

PDF

69.3 KB Created: 2021-01-08 19:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 601bec6a8d5fa21fd06f2cb85699fe1c SHA-1: ee101160ed9891308c67c0d364b1604da2f932cf SHA-256: 52c595113370d4ea8edb6cccad50d57865668147d9abf85a1994eb9a7843e857
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=plural+possessive+noun+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453721/normal_5fad8c6fa2c9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413238/normal_5fc479900d763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5fc7de1b67806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_5fd968c6c63dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_5fdb1fee27fe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fc853da642fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a75bfb-fd26-46e3-96a6-7cfd01de311b/chauvenets_criterion_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f32e355-7091-4e1d-bd6d-1d1ad8b80431/samsung_my_files_app.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/masanaforepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a70c32-041f-4e12-9680-c85adc557159/warhammer_total_war_chaos_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb925626-910e-4008-ab41-ebf57b25084b/50_phrasal_verbs.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/zotamalisexesipopoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d814789-3e86-4f89-b6fd-8e2ac17d219e/car_driving_simulator_drift.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/firefox_for_android_old_version.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_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 5124 bytes
SHA-256: e729531ae5b7ff5b1fd09caef559d88c70bdd39a39c29f32bc53fef020da3ca4
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 10468 bytes
SHA-256: fd7d7b09bb97e5e3337bed59d94b054758c8d21b36a44943a329ea1b7415eaa7