Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4183c5406907ef…

MALICIOUS

PDF

93.0 KB Created: 2021-03-11 08:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 03bb3aedaef8fbf0fa6c69d1975b4053 SHA-1: e415a46dc5c600a36cfe0c33b0f3d8e601fceb19 SHA-256: 7d4183c5406907ef5d26137bd2f5dc90cd238566c96bcfe5e3b3dda955f5a363
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://zajinet.ru/award?keyword=coffee+break+spanish+season+1+pdf', which is likely the malicious payload delivery mechanism. The document body, though heavily obfuscated, contains references to 'coffee break spanish season 1 pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=coffee+break+spanish+season+1+pdf PDF link annotation
    • http://masterpowerpoint.com/46811311458mnirp.pdfIn PDF document text
    • http://slamelina.website/251371369081jabp.pdfIn PDF document text
    • http://bamasadukarudam.iblogger.org/11868273732.pdfIn PDF document text
    • http://naxovigemelewe.iblogger.org/que_parte_de_la_biblia_fue_escrita_en_hebreo.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://uploads.strikinglycdn.com/files/80ebc623-c0f2-4066-b0b3-6e8f48f963b5/msi_n1996_motherboard_audio_drivers_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb897b21-73f2-404e-96c2-eeef326bd068/62309800848.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/free_professional_binder_cover_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/dimin.pdfIn PDF document text
    • http://betesemimototi.rf.gd/firumitazarema.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/rutekiju.pdfIn PDF document text
    • http://tejojode.rf.gd/jingle_bells_original_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a368be40-1cd9-4fa1-9a3c-22d8ac7a7596/26519843223.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_4009baf5b8474f85a63e61008a64406c.pdf?index=trueIn PDF document text
    • http://simorunobulo.rf.gd/kukupa.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/vozopunofinizijozipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e069fe-2c09-4478-9472-60301068f76a/verb_list_a-z.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_d9dd89fc7ad04197b95fe5d745cd94c6.pdf?index=trueIn PDF document text
    • http://sifebina.epizy.com/how_to_reset_bosch_axxis_washer.pdfIn PDF document text
    • http://maguzuj.rf.gd/ielts_academic_reading_practice_test_2012.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_0d1c0f2748964d1cb06c83f6f7ce5f3c.pdf?index=trueIn PDF document text
    • http://zepurudevivo.rf.gd/breeam_international_new_construction_technical_manual.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_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 5084 bytes
SHA-256: 4d536bb3051728954d5cab4e399c6a1038d4ca687087085d03304e2d0fd62d14
font_01_sfnt_off000128d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 15176 bytes
SHA-256: 6524cfd03a71271a7cd305239dfb480c25644a6bbc80cd02defbd5874066ec46
font_02_sfnt_off0001585b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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