Malicious PDF — malware analysis report

Static analysis result for SHA-256 de71a9cec2b2b3e4…

MALICIOUS

PDF

86.4 KB Created: 2021-03-14 00:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5b70e95599536acb6519425a24d6d45 SHA-1: 9ed8d6336bef121132c861e65abe76f68662b047 SHA-256: de71a9cec2b2b3e416ceb061f96ef524e68e29ef7eb1a4ae1a951270f42751f8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://leonvi.ru/wix?keyword=download+spongebob+moves+in+apk+%252B+data PDF link annotation
    • https://cdn.sqhk.co/loberutebe/fjhifDl/castle_td_mod_apk_unlimited_all.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/ELigjhg/kogama_brasil_login.pdfIn PDF document text
    • https://cdn.sqhk.co/danajuva/hhgeidi/27252112383.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/jhlWqje/overkill_3_pc_keyboard_controls.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/ghasidQ/rofimewulo.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/eVgpAja/51817723646.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/ivN0gf4/23015443353.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/auEifgg/downsides_to_being_a_werewolf_in_eso.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/euLjfgf/arcade_donkey_kong_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/sEPjjjh/zubevutopivekurodilavevib.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ipI8hg6/felifotomilere.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/haibieg/cleanliness_drive_in_school_report.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/iiLAif7/north_star_casino_promotions.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/hfCifYR/world_war_1_museum.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/dhdijgi/rudukesutafajezaxifawaf.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/WjilhfB/merazituzosalupilew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7120f1c2-94d4-49fc-8e63-64c4ceb3188a/what_is_leave_purchase_allowance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef8fe13-2e5d-4058-adf0-e213e11ab1af/99019938608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70cd4ff-1c77-4f47-8530-201cbef8a320/47890321235.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_2b1a8c230108406f9ed5e5fab86be557.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_b331974ffbc0472f8b719bc033b55b5a.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 3084 bytes
SHA-256: f24846e024915e51fd8f90e2c528666278dbc3f9e9a5595f388da4e795c26caa
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 5536 bytes
SHA-256: fce7f88d1249cad5b089745dbb7f87a9672f4e1032fa8cb2644173d86adc05cf
font_02_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 11528 bytes
SHA-256: 38ab80f11f9c6007e82a6abf6e1716f7e4e7abc92750023534a0cc92d789a0ab
font_03_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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