Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a482e960819929…

MALICIOUS

PDF

81.7 KB Created: 2021-03-11 15:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4fc21458d95d9b8bf1f707ef0c195db SHA-1: 7fab0bb8a9209aa682ffdaa60cab8c8a5f2b9df8 SHA-256: 54a482e9608199298aaf8f245ea5e34616d2733960e735073c2db156c957162b
96 Risk Score

Malware Insights

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

The file is a PDF containing obfuscated content and an embedded URL pointing to a suspicious domain. Heuristics indicate it's a malicious PDF, likely used for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=4th+grade+social+studies+chapter+10+study+guide
    • http://mavitrade.com/eustigmatos_magnus_healthmb4gm.pdf
    • https://cdn-cms.f-static.net/uploads/4491148/normal_603eb290ea97f.pdf
    • https://static.s123-cdn-static.com/uploads/4426974/normal_600809ee32ec1.pdf
    • https://static.s123-cdn-static.com/uploads/4407784/normal_5fe1955387fde.pdf
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/jarewilorefetijigu.pdf
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/bowaxizi-sisabanuvapegu.pdf
    • https://cdn-cms.f-static.net/uploads/4457011/normal_60415d8816fb4.pdf
    • http://easycreditscore.info/present_continuous_tense_questions_exercisesna7ug.pdf
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/1311497.pdf
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/d9f13dd8da18104.pdf
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5ffc94526c6c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jipowumat/97952481844.pdf
    • https://s3.amazonaws.com/tedowafomaru/wexagimutozofakizagu.pdf
    • https://uploads.strikinglycdn.com/files/efd86fa3-0303-4bec-864e-b80f736fabb9/46784503755.pdf
    • https://uploads.strikinglycdn.com/files/e29776d2-287b-4c48-89a5-0611105d2d2e/animorphs_the_invasion_graphic_novel.pdf
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_edf9d8c7587b41458e481408bd4b8976.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75fb2fbb-f72f-4aec-90da-5d70a7dae869/74894696556.pdf
    • https://s3.amazonaws.com/wefemabeni/how_to_improve_spray_control_csgo.pdf
    • https://s3.amazonaws.com/sulasatevirexo/adobe_acrobat_pro_dc_to_word.pdf
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_b24da07d05ae4c66a293e0a3d3d01c07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/040462e8-2c86-43b4-aabf-7207b8df6e91/rixuwedabijilasigor.pdf
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_9ae5b1554f9e4976899c4ab97a91f930.pdf?index=true
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_422a9e098ccc4736bc427eb332df6e16.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020b.bin
d9e129e8f66916fb9c36fd8cb6f45075060f5963bb5d075160093bfc8dbe9e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 5624 bytes
font_01_sfnt_off00011538.bin
f383a07796675d7b3673d0be011c9dd2a39c47f9809ff6de373bfbde58c348fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 10404 bytes

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