Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec84b162f1c17b1…

MALICIOUS

PDF

92.8 KB Created: 2021-02-07 21:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c6dfd8b2d93092d7862c1603fec404e0 SHA-1: 7873951b4974a07bb106e9e0a9676af33d292154 SHA-256: bec84b162f1c17b19d5c598c5ef7a3cc22bd8122e6c7c074b7c07de6c321a151
96 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs, one of which is presented as an 'Edwin diaz contract'. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs suggests the document is intended to redirect the user to a malicious site, likely for phishing or to download further malicious content. No scripts were extracted from this sample, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/123?utm_term=edwin+diaz+contract PDF link annotation
    • https://suruvimaweluza.weebly.com/uploads/1/3/4/1/134131456/tikor_tamasew.pdfIn PDF document text
    • http://bitcoins-profits.com/70537778547klulq.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/g2hcqws/zavigunebuno.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/h4phbja/fill_one_line_puzzle_game_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_5fecd4f4eaa55.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/7008827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_60155a2c375d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420250/normal_5fcda8f90a23d.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/dSawygw/best_voice_assistant_for_samsung_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476782/normal_5fc757a38d4f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vukusa/adobe_flash_player_for_android_8._0.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/19811495829.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012c41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12C41 24820 bytes
SHA-256: c0f4a85914df947a59d79abdc4446f9ebf18989c30f96b0dfc4da62f82d2b917
font_00_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 4492 bytes
SHA-256: c5dfde6989299e7f46a66b12b71692450faa4d1209413bb40d6a93e45576dc60
font_01_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 11732 bytes
SHA-256: b89b4a864057c71e077c652760f8877294954a8168aff52e5552b5254861f5ce
font_03_sfnt_off00015852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15852 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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