Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9d3cde212bf10b…

MALICIOUS

PDF

81.9 KB Created: 2021-03-19 10:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9feef8b713dfc88a46875e72f39e0e2c SHA-1: 2453c276571a73301674c2c72785a789bbb600a6 SHA-256: bb9d3cde212bf10bbb5ca5f781d4c0f6d6b9519b80c8af956172d831029ac755
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, with a high risk score. It contains an embedded URI pointing to 'https://nipisod.ru/strik?utm_term=probability+worksheet+pdf+grade+7', suggesting a lure to a phishing or malware distribution site. The document body, though partially corrupted, indicates a 'probability worksheet pdf grade 7' theme, aligning with the malicious URL's query parameter. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=probability+worksheet+pdf+grade+7
    • https://static.s123-cdn-static.com/uploads/4409256/normal_5fe50259dbc2b.pdf
    • http://nubemeketetu.mypressonline.com/ropigosowegafitopugas.pdf
    • https://cdn-cms.f-static.net/uploads/4424007/normal_60462e1835f1e.pdf
    • https://cdn-cms.f-static.net/uploads/4383128/normal_6036a995625e7.pdf
    • http://fawotewikobafis.iblogger.org/noxenikonigofiwibib.pdf
    • http://najetaxu.mygamesonline.org/sizepetakowiwebejivuka.pdf
    • http://jinobuzid.scienceontheweb.net/18084636283.pdf
    • http://gexopidikimo.mygamesonline.org/toxower.pdf
    • https://cdn-cms.f-static.net/uploads/4476567/normal_603ed4ca1f055.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tipikaxe/zagemogivebokoka.pdf
    • https://uploads.strikinglycdn.com/files/d20a3680-d0de-4298-9eee-c15c445c5d81/create_weight_loss_chart_excel.pdf
    • http://mifedisiso.atwebpages.com/81648359662.pdf
    • http://bopagit.rf.gd/fonowavexelatubed.pdf
    • http://binuwuzipu.myartsonline.com/tuwefeteluf.pdf
    • https://s3.amazonaws.com/bexolamabad/accountability_partner_app_for_android.pdf
    • https://uploads.strikinglycdn.com/files/915deaae-1125-4d2d-b0ba-989e0b92adcb/85768883084.pdf
    • https://uploads.strikinglycdn.com/files/a5e68b90-cfc9-4867-86ae-d30e0a219400/nugitizulojudiles.pdf
    • https://s3.amazonaws.com/zifozujiwi/american_buffalo_knife_and_tool.pdf
    • https://uploads.strikinglycdn.com/files/8771be62-d3f4-4585-ae2f-cc65ba6b772f/98615515254.pdf
    • https://uploads.strikinglycdn.com/files/dcd11931-fa73-4599-a895-9d4d1bd03564/how_to_use_intercom_on_vtech_phone.pdf
    • http://levapoloj.onlinewebshop.net/lenix.pdf
    • http://fozozip.onlinewebshop.net/us_army_field_artillery_officer_career_path.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/95567342170.pdf
    • https://s3.amazonaws.com/bulikowexunepov/yard_machine_snowblower_8hp_24_inch_parts.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ef.bin
3fc8be81aaea4c26e5fee56dc3c34294660dd85a895a0bf4faa7146969918a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 5784 bytes
font_01_sfnt_off0000f9b7.bin
a45d9b1d5cc2a3ebe4110bab531bd4aaf5034934edabdc376b9215c269195447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 11896 bytes
font_02_sfnt_off00012211.bin
47f6a834b04b5efd70e34cfe398dfbd0981f9cfd794e60243ad795853259022c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 16772 bytes

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