Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadfd8a89d0886cc…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 10:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7eaeaa2a9df9d0458e834061f37ab1a SHA-1: 7e919fb72f365c3079dd6a56e95d0e3cf608a994 SHA-256: eadfd8a89d0886cc97a12844b235ad9c778b310d2bf94f91812c995352ffcc10
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The presence of 'curl' in the document text and the ML classifier's high confidence score further support the malicious classification. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a likely attempt to deliver a second-stage payload or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=montgomery+ward+sewing+machine+model+30+value
    • http://csxmoney.info/fapilepowizidana3sc3p.pdf
    • http://trokot-roznica.xyz/rip_curl_gps_watch_replacement_band2lb6n.pdf
    • https://cdn.sqhk.co/zezetemirag/jghb7Pi/95040093645.pdf
    • https://cdn.sqhk.co/lodesejidi/5icij0y/vorimagudubovezozivan.pdf
    • https://cdn.sqhk.co/salenasova/yhhhbrg/recharge_pcs_arnaque.pdf
    • http://centerverifybadge.com/47616529293zacmz.pdf
    • http://dontbeshy.xyz/3d_max_video_editing_software_freexyjz7.pdf
    • https://cdn.sqhk.co/gukokefa/7Hjg6U4/92388417271.pdf
    • http://50offit.pro/jejomefinixizicz9vv.pdf
    • https://cdn.sqhk.co
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wovedukevikov/31265690351.pdf
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_f7c10cb2944543568d76019d675b3be1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f33393e-b990-4492-8a26-2c52e90e9a36/what_is_the_real_story_of_the_blind_side.pdf
    • https://s3.amazonaws.com/zemunomipazikez/gauselmann_ag_annual_report.pdf
    • https://s3.amazonaws.com/biwubeleba/55613063581.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_9a1517b6cd87467295b997fba819297b.pdf?index=true
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_a9b38c4236574e719d4fa66e37db00de.pdf?index=true
    • https://s3.amazonaws.com/sukobogixe/luzoxaxosuxatozazabipu.pdf
    • https://s3.amazonaws.com/fezenur/87435719347.pdf
    • https://uploads.strikinglycdn.com/files/ed66468e-e6e5-472b-a1b2-cd59a89d9439/collar_x_malice_unlimited_-_nintendo_switch_standard_edition.pdf
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_1f9b4401d1a44d4e8b347ac7074aa7c6.pdf?index=true
    • https://s3.amazonaws.com/mexijegedakol/business_continuity_plan_template_small_business_uk.pdf
    • https://s3.amazonaws.com/zesixefe/baratigekebiwigitas.pdf
    • https://s3.amazonaws.com/tejuvonixag/nofexajokimis.pdf
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_09e1f0d37a504d9697b476a6de3eaf9b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3d6a5ec6-89b6-4353-8cea-9e77155110c4/basic_physics_book_in_hindi.pdf
    • https://s3.amazonaws.com/bulolimepol/mujiwesaboguregedizubol.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe5.bin
5fa3d4d731acd0e96717ad1b8a1508f5a5055fed8ba756e59e12d70b4c390c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 5920 bytes
font_01_sfnt_off00010408.bin
23652e60a6ba88847cc8726cab6ef7398f8c6c41cbacabc1e0f64e8395b0fe76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 10536 bytes

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