Malicious PDF — malware analysis report

Static analysis result for SHA-256 9170ff986e46e65d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-11 00:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9d2b4f33c2d6e90bcba69761556949c1 SHA-1: e449db365cc181534d612c210f16e9a9359c0927 SHA-256: 9170ff986e46e65d7a20eb5cc5d1f175f24c597dea3d456420d8750fad7ede73
96 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'GRE math subject test practice questions'. The presence of external URIs indicates an attempt to redirect the user to a malicious site, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/aws?utm_term=gre+math+subject+test+practice+questions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490121/normal_60079b10e5420.pdfIn PDF document text
    • http://jusapp.club/navy_n_codes_n803d51.pdfIn PDF document text
    • http://microdigitalmeter.xyz/46674025151dngkt.pdfIn PDF document text
    • http://igafnd.org/poker_liar_dice_ruleslhfd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_60487285152b9.pdfIn PDF document text
    • http://liolika-rsya.ru/11924465141cqom9.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/3jghifw/murosuzukimuzabo.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/Khb9ihb/15716955329.pdfIn PDF document text
    • http://bestrongbyg.com/sorixuxagevoxupomixekuxu6mxdh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5fe3885581135.pdfIn PDF document text
    • http://stingeksoj.online/gekazabalobanifoklenjo.pdfIn PDF document text
    • http://goldotzyv.ru/jalitolobitaruweludowusig9e0j8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485946/normal_5fe1418f963bd.pdfIn PDF document text
    • http://sarhello.online/89967644836jkhjj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_60480a9f53c6f.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/i1Bgegd/photo_finish_horse_racing_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_5fdbb4994e1c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_603c583ed5c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_601664f701848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5fca65a1c5594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5ff29f10e4e2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5fcbe35583e86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5516 bytes
SHA-256: 66a30ca210c0e0e567997c4d381de93a1f1cf4bd6c91bd43e07a74989435941c
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 11720 bytes
SHA-256: ce9e4288a5bda486d3b8b3cc0bcfdd49660132e422061c75da2ba38de7d853e3

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