Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadabe815ce328d0…

MALICIOUS

PDF

81.0 KB Created: 2021-06-02 13:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2cc1fd6443be480589f5330ba1ec3188 SHA-1: 5cb188d87d4814b9387e42422ce99d6528e985fa SHA-256: aadabe815ce328d0d2bba403144dcfa35706c3b92fcafb9d57f1819003f02b93
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL pointing to 'nomylo.ru', which is likely a phishing site. The document body, though heavily obfuscated, suggests a lure related to academic answer explanations, a common tactic for phishing.

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://nomylo.ru/pbw?utm_term=april+qas+2017+sat+math+answer+explanations PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387232/normal_5fc85cb396977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_5fec0dfcbd9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_60463ddd1411f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5ff9ec65b7df4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_5fcae93451cfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97bc893a-9f5e-4b5c-b222-836a6f5adf2d/how_to_pair_altec_lansing_bluetooth_speaker_to_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f647b04e-3a8f-4b6e-acd1-ada8c6e977a1/didaluvirawilumozowog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d74a04-8b73-4a26-831c-91847794b318/el_manifiesto_comunista_marx_y_engels_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a784a42e-ba62-40f3-9378-debf625a7b53/71588646077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22c9371-fdde-457e-b73a-5a91baa1d93f/sikijut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d47c3cc-dc5a-4f17-a98d-4036258769fb/panasonic_australia_support_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782efb41-b738-4b49-97fb-fd82da46acef/how_much_does_a_skyjack_sjiii_3219_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfffb2ab-1f30-4950-b345-68060be7dcfd/tebasap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42e7f55-a8a2-4932-a1cf-7a18011ad5af/moto_x_2nd_gen_lcd_screen_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688d30f8-b362-4e3d-a530-ecc7db57e98a/descargar_formato_de_curriculum_vitae_basico_para_llenar_en_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8dc817-0115-40b8-b09a-7786e3782b80/64752576449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1b511a-e0ed-4bb9-b6e0-39186c772e2d/rizapazigaxejom.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_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 5740 bytes
SHA-256: 8cda890e7694807f626b85d0e3b409ee7b388b34036de0aa738b66c8527ca117
font_01_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 12464 bytes
SHA-256: 1516f20295138677c02198f820518bef0feb48911df9ec54576c90446a90f49c

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