Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1ebac72869ca8e…

MALICIOUS

PDF

91.7 KB Created: 2021-03-24 20:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9e210d92e133077ae57479a08d0b6850 SHA-1: 628b71a9396f0f1a7dcb2d2386d6e564c6aef677 SHA-256: dd1ebac72869ca8eb767e8c6c489a1bf5da819371ca81365a98efcae968b54e6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary URL, https://vilenefex.ru/wix?keyword=capitulo+3b+realidades+2+answers+page+65, suggests a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://vilenefex.ru/wix?keyword=capitulo+3b+realidades+2+answers+page+65 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490127/normal_6003b53f37eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475715/normal_605010c2a031e.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/free_rental_agreement_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_601d6108eaa56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423148/normal_600089c79d5b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_60400d53013bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_602d83451ca06.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/kujobetagimoxukep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_bee149021e0646a2949916995cb0b8b6.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_346fa45bf05c4a17be3c89da8ddab8fd.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_e007e306ca43489fb052dc13574db4f1.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_e1e3f1f82a96435cbd5ba703008a0afe.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_b208e869b4aa4281998695ca6366981f.pdf?index=trueIn PDF document text
    • http://xewepipesu.epizy.com/pilgrims_progress_journey_to_heaven_full_movie_download.pdfIn PDF document text
    • http://kunijudodo.rf.gd/que_es_la_aspiracion_de_secreciones_en_el_recien_nacido.pdfIn PDF document text
    • http://sukujarodapix.rf.gd/top_5_beat_maker_apps_for_android.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_ba1f4fb5bdc145819b173294d4a1f770.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_815daf04ff8248f395aec42a7f52b14d.pdf?index=trueIn PDF document text
    • http://buteboregof.epizy.com/vorotidufajules.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_0567fb76e511436eb2861c2c83408e07.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_6d66768d54f142488e9a8e3369adc10e.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_e69359715227439994c0440294209926.pdf?index=trueIn PDF document text
    • http://witeguxatuzidaj.epizy.com/848635825.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_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 5840 bytes
SHA-256: de638ef1d2b81d3e1674ca80f7210c3d9e6ebeabb351b0aa610af3b9b30817f2
font_01_sfnt_off00012ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF8 16104 bytes
SHA-256: 55794860ef95be48bb669af23b6bf3314189b3529a5fc3f09ead182004398871

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