Malicious PDF — malware analysis report

Static analysis result for SHA-256 de597ef0b4b02c42…

MALICIOUS

PDF

77.1 KB Created: 2021-03-05 19:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: caa8598bf063e9ae54436bed6cc5b47d SHA-1: c10d3614dffa8bd722df244fcc29cda9e3afc53e SHA-256: de597ef0b4b02c4286870d4a63d56612f679c1e98bffcee534980772741e0a3d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, one of which points to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/wix?keyword=classifying+animals+worksheet+for+kindergarten PDF link annotation
    • http://funomixukipiv.iblogger.org/87131167009.pdfIn PDF document text
    • http://fredo.bike/pdf_drive_apk_uptodownitom9.pdfIn PDF document text
    • http://rumokerejimo.iblogger.org/railway_reservation_form_filling.pdfIn PDF document text
    • http://creditinquiry.info/big_little_farmer_game_mod_apkdaqd5.pdfIn PDF document text
    • http://pihodze.com/agfa-_gevaert_annual_reportnsfi9.pdfIn PDF document text
    • http://apsdd54gfv.xyz/38093604068oe2wb.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/donukadizolin/basic_balancing_equations_worksheet.pdfIn PDF document text
    • http://noxebujo.epizy.com/36345915132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0260c2-6d5c-4ec5-b09c-b8ec8f3d9a01/57506494834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15825d10-2fee-49e8-803e-6a71668e3948/casio_sgw-1000-1aer_opiniones.pdfIn PDF document text
    • http://kisezemewarajox.rf.gd/sagapapi.pdfIn PDF document text
    • http://zadosuwiwebuw.epizy.com/d-link_dir-615_h1_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eac7ab5-d7c0-44ea-8abb-878a2238ee79/fipopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f530d983-2bda-4bc3-85b2-31047a6e760d/polk_audio_psw505_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/rbse_class_11_biology_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d6da3f-496c-491c-9c8e-85aa9909bfc6/simplicity_snow_blower_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/39519691946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c35c6d0-4ce2-4616-abdb-b69e5df0a108/digirack_002_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ab7f23-be1f-4f6b-8bc2-9001471d0dc4/29824031030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88035b0-c341-46ff-ac17-f0839bd1d981/46784122434.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/51462797417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf3736d-f2a1-447b-b14f-1d9b38b701b9/python_class_example_code_github.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/how_to_make_equipment_damage_report.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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 5484 bytes
SHA-256: 0d73cfa25ee39d90361228ba89d6f6f0d8fba0e25c3384cb85abdfc16b567462
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10240 bytes
SHA-256: 40e3a03d46a22667219b6ecff8151b7dbd598393e8279c39f2b1658286b39550

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