Malicious PDF — malware analysis report

Static analysis result for SHA-256 89abe03c62b33d54…

MALICIOUS

PDF

68.3 KB Created: 2021-03-31 18:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85c5628f2020693de8f5151f94d86ae0 SHA-1: 5397135760479a104e2d0bc7c4adf8cbaf5afddb SHA-256: 89abe03c62b33d54b4d3c4347494aee506c671833fdb42587f12867793ce6433
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to PDF files and URLs, reinforcing the attack pattern of directing users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/award?keyword=holiday+in+paris+william+gillock+pdf
    • http://vazitafolozif.22web.org/human_figure_drawing_test_interpretation.pdf
    • http://rasixojolebasug.iblogger.org/sogig.pdf
    • https://cdn.sqhk.co/kigimole/gflidk7/alienware_gaming_mouse_pad_with_led_rgb.pdf
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/kudurijijebuki.pdf
    • http://maxedomuw.22web.org/modern_calligraphy_exercises.pdf
    • https://cdn.sqhk.co/wajidafix/Kigfr6N/5266624300.pdf
    • https://donumidivapog.weebly.com/uploads/1/3/4/7/134734387/1591096.pdf
    • https://cdn.sqhk.co/nixibaraje/jaEjeja/tangle_teezer_thick_and_curly_review.pdf
    • https://cdn.sqhk.co/femelofep/Ihcxu6R/go_karts_for_sale_under_500_dollars.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f053bbfa-4e89-49c6-8c6c-b555e9f14e2f/wufapodedopovuzojurikaxal.pdf
    • http://gubojudojo.epizy.com/92380523578.pdf
    • https://uploads.strikinglycdn.com/files/7b6b9798-c7b7-4f65-b195-bae0efcaabb2/24696801143.pdf
    • https://uploads.strikinglycdn.com/files/784e75e5-b4d1-4c5d-b3d3-c710577e730b/71531137838.pdf
    • https://uploads.strikinglycdn.com/files/710911d3-16d5-4c5c-8985-f59e8ba29b48/vulubajuwapunadamupogaz.pdf
    • http://xadapokudenez.rf.gd/37766544689.pdf
    • http://fimibujoreza.epizy.com/how_to_explain_senses_to_preschoolers.pdf
    • https://uploads.strikinglycdn.com/files/d23ffade-f9eb-40cd-af50-7d4e6fbf04f1/best_free_logo_design_software_reddit.pdf
    • https://uploads.strikinglycdn.com/files/a024f238-c33e-41a1-abf2-df1bdac9b741/kenmore_trash_compactor_parts_list.pdf
    • https://uploads.strikinglycdn.com/files/e4cc1b21-76a3-48e7-a8af-ac71ff63d1ad/31637419856.pdf
    • https://uploads.strikinglycdn.com/files/8ba3d2a1-5e09-45ed-90a6-99908e95b7dc/does_cigna_cover_spectra_s1.pdf
    • https://uploads.strikinglycdn.com/files/de8fb362-5c56-40ff-a995-9d4deae20510/12448948154.pdf
    • http://jamadex.epizy.com/lowes_troy_bilt_lawn_mower_blade.pdf
    • https://uploads.strikinglycdn.com/files/b8718d99-9a1d-46ce-915a-58214a2da374/88707705269.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/
    • https://uploads.strikinglycdn.com/files/e4c
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca44.bin
5308615094a4c7347a18bd852d0f6dcabfd9625097e7a2414679f9db6b71ab25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 5692 bytes
font_01_sfnt_off0000ddb3.bin
c924d7a61ce208600f959240dd6e069442d0acf7f0af881fd328cc9e6e9d9f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 10984 bytes

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