Malicious PDF — malware analysis report

Static analysis result for SHA-256 6373e61f76cdcc1d…

MALICIOUS

PDF

70.1 KB Created: 2021-02-18 16:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6eb6d8af267762001c853e0eafbdb813 SHA-1: c7e558712ff8635f2d07602fcca8834689d98152 SHA-256: 6373e61f76cdcc1de1951d8d5036d95ce8e3bca85531a2c4edb84f14ac1aa47c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational content to entice users to click the malicious link.

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://baarspo.ru/strik?utm_term=common+core+standards+ela+grade+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427091/normal_5fcea33558721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5fec288a059ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_6022c48419b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_602462ee7cee6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5ffe20e5ed948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_601de7269a076.pdfIn PDF document text
    • http://help-verification.com/water_today_magazinevg2db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495240/normal_5fc66c170d7c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5ff0865e4e89a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452171/normal_60055396a1cac.pdfIn PDF document text
    • http://xepusuxewo.iblogger.org/anthelmintic_activity_of_plant_extracts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5fdc2d368b86c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5ff097429c12a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fd3baab7d6c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393018/normal_5ff773c8f1878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_6027b4c2bed7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuweba.rf.gd/online_taxi_booking_website_template.pdfIn PDF document text
    • http://vupafigimewex.rf.gd/kachava_lagav_lande_bhagav_song.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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 5328 bytes
SHA-256: 1019c8dd8f593225b8a369785ea97b99b1fa66c8123af0f00ff3f7edc6ec2ae7
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 9864 bytes
SHA-256: 55404de3d0b4dcb2801421d1188de670f6d1c56a4f18bce129377276c6831092

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