Malicious PDF — malware analysis report

Static analysis result for SHA-256 8810e4c503307a2a…

MALICIOUS

PDF

80.6 KB Created: 2021-04-07 16:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e9aa91a72be58b8d6b2c7e66cd8bafb9 SHA-1: 8bd9b2d76b979aa563f4a618e9e93cc31b6c1663 SHA-256: 8810e4c503307a2a04935d9ab5bd0db63c5e8d77226d7e94c50d1c5acd70ace2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with one pointing to 'jacksth.ru', suggesting a phishing or SEO-based lure. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wix?keyword=sacco%2527s+bowl+haven+brighton PDF link annotation
    • http://xukosususif.medianewsonline.com/bharatanatyam_mudras.pdfIn PDF document text
    • http://rosolab.scienceontheweb.net/12211682003.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/22310087740.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/80bf0ef8-42b6-4aa3-bdc4-e26edce7c05c/ace_electronic_water_timer_3012_instructions.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_eca5eea4b6404dbdb957f8cc794063fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a85974-0eae-4715-ab0f-75b01328d808/tofajofibilamafipukipuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/airplay_apk_free.pdfIn PDF document text
    • http://bemabam.myartsonline.com/cardiomyopathie_dilate_primitive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/045707f9-aa0d-4d13-ab01-2fc959b03d97/husqvarna_455_rancher_carburetor_removal.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/principles_of_geotechnical_engineering_8th_edition_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/77455995411.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/laduvajidiferexemezuxak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76548caf-9d6f-4b7d-bb90-e3fd9286d3bb/91086192312.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_623a7df4c5814d149ae29a511fa0df9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c64111-f61f-49a1-97b8-13fbc48e5e6a/single_pole_fishing_for_crappie.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/mcafee_antivirus_for_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/fabizujizov.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_794069c92dc74d48badbc082ca50ce7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a1b845-c698-4f9f-a42f-3057998de654/mitsubishi_mr_slim_air_cleaning_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9eec34-73b6-4063-a878-88270bc69e39/54445669289.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/free_online_weekly_schedule_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/veg_recipes_of_indian_moong_dal_fry.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_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 5276 bytes
SHA-256: 7382ae6103726f80cd7c7eeca1e750142a8f4b9c70aa3e65770b367be7f68dc1
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 11196 bytes
SHA-256: 58a0b2c12a4767ffe1c933e34f8681f9f3e67d7d640ebb52f1d20ef176f89ef3
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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