Malicious PDF — malware analysis report

Static analysis result for SHA-256 814103ab9e88ffaa…

MALICIOUS

PDF

69.9 KB Created: 2021-02-23 00:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a6423ba2678d21c01218059e0487f0ad SHA-1: f16228a59e58b970aa5c010562bf100cfc116b2e SHA-256: 814103ab9e88ffaa0fde8f120e33b44de47a879ade8246e0f8f0b7202e41c9c0
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a site offering a PDF download, likely a lure to trick users into downloading further malware. The document body, though heavily obfuscated, appears to be a pretext for the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=how+to+hard+reset+a+nook+1st+edition PDF link annotation
    • https://cdn.sqhk.co/polopomoset/didfgja/fireboy_and_watergirl_5_release_date.pdfIn PDF document text
    • http://form-copyrightservices.com/34235232665n6x3s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_60276f2711b5b.pdfIn PDF document text
    • http://static-get.top/history_books_free_download_in_urduhlzn1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474471/normal_5fde50578a27a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fc969beb7954.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokiwil/gfs7Mjg/infectious_mononucleosis_rash_images.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jgxgi98/super_adventure_box_skins.pdfIn PDF document text
    • http://lamovingcompany.com/935589701672fnzj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_5fd68bc156b5f.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/6iapXGL/belazineb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5ff1ce4108064.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/diwitapezu/limutobonujozotik.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/fba_arcade_emulator_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/96939961575.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/93523037095.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_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 5052 bytes
SHA-256: c725cac54ea5df6f5a8e75626d13af4e4fb608c6dfb6e1560b4d780f1b1041c9
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 10168 bytes
SHA-256: 27531586d7bf0632f2d821ceb63304f10378c75635b8190b536b7d450905177e