Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6d1c504ed56bfb…

MALICIOUS

PDF

69.8 KB Created: 2021-01-01 05:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f95726cff132abd7729300ed2b408441 SHA-1: c0764446cca4b18152c65adf980b1f0c78b80a7b SHA-256: af6d1c504ed56bfb4c7ac99696f9c0c5b1795d5144a0e0243a7f0e34daa2a6b8
104 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 identified as a phishing trojan. It contains an embedded URL that suggests a download, and a heuristic detected a visual download button lure. While no scripts were extracted, the presence of a malicious PDF with a download lure strongly indicates an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?utm_term=red+crucible+2+download PDF link annotation
    • https://cdn.sqhk.co/zoxibovesiva/ibZjdSR/jomavuxixi.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/hgjiXgd/kavopezodogotirajozaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_5fa668a8c81d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8c299fefe4b.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/kegubinefuda/fast_food_menu_card_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d487c95-f35c-4452-9952-3035896727f6/17765671235.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/shaggy_songs_why_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec0f5b1-df76-4b9e-8252-ae178ee32402/wenewakukukaxapav.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/informasi_bmkg_ambon.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/45910506293.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/16693744026.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/symptoms_of_pcos.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/clion_reformat_code_c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 5128 bytes
SHA-256: c57c165990558a566db1fd554dfb2f60214339c005f9080efcb50e0d7f47f9a5
font_01_sfnt_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 10388 bytes
SHA-256: 4e1d06cda9de85418100de2731535d25d85933ee6f8816fc4c1ece7429f9f539

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