Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8e49ec039ea1d9…

MALICIOUS

PDF

74.9 KB Created: 2021-03-28 00:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 877b046e8349a800ee66553151e2ce34 SHA-1: efef94385d13009656f6125addada1eefd906bc5 SHA-256: 6e8e49ec039ea1d95fc36a3f217f054f73632d926ae6789505d12b6286475bb3
134 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to obscure the true destination of malicious content. The 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of numerous external URIs strongly indicate malicious intent, likely to trick users into downloading malware. The document body, though heavily obfuscated, contains text related to sheet music, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/123?utm_term=alto+saxophone+sheet+music+free+printable PDF link annotation
    • https://cdn.sqhk.co/wikepijosipi/TBnrjcK/descargar_bad_2_bad_extinction_premium_apk.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/7908587.pdfIn PDF document text
    • https://bitoxogosem.weebly.com/uploads/1/3/4/3/134386372/refetoridavikixavoku.pdfIn PDF document text
    • https://xalofaba.weebly.com/uploads/1/3/5/3/135339869/18b2d524904e.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/paradiruxigog.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/8dijgid/litejovuver.pdfIn PDF document text
    • https://situtewazugigev.weebly.com/uploads/1/3/4/2/134265876/levimolu-nasevu-mibupevakilavim.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/fabopewofuz.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/ciijhhj/70667622744.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/dixife.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/83697229738.pdfIn PDF document text
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/kapetaxemix.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/wozirojurosa.pdfIn PDF document text
    • http://napodosawukezob.getenjoyment.net/quotes_from_the_book_speak_by_laurie_halse_anderson_with_page_numbers.pdfIn PDF document text
    • https://goxepafanaba.weebly.com/uploads/1/3/0/7/130739763/lubevemukokuxu-raxujep-fimoxejim-jilepoz.pdfIn PDF document text
    • https://cdn.sqhk.co/dosijowikul/mZfNcOe/algebra_definition.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/5b494b7c-2f4c-4c6f-acb6-225737214ec1/2020_audi_s4_avant_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2d2356-6826-490a-9e03-b154cde4565b/xisozezidebovuzuvan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b00c91-b1d9-412d-9191-4fd03fbec484/excel_vba_get_column_letter_from_range_variable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4589c32-2d14-4c15-8fb0-4dcc7a86aa26/buddha_brain_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df4e655-3ed7-4ad4-b173-d27196769752/sony_tv_remote_codes_5_digit.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 5452 bytes
SHA-256: dd43bb32ab74afb3781ccb2e61b05489353158634ca5f64a43f80bd6ff77837a
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10880 bytes
SHA-256: 33de1d064046015c4279839c1c008435d1e30b66fb7795180a4ff84cb84e08be