Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50bed50baf49178…

MALICIOUS

PDF

83.5 KB Created: 2021-03-19 20:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 187b7c9fb26b7cf32aeaa3c18f16e97a SHA-1: b9063fc35f8b56f92c9ed18b5d3d1804dd828b0c SHA-256: e50bed50baf49178f4f7a3b0e8885dba2837fd10a8d1c4de4d0d975e780b2947
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

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.
  • 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://dugedepap.ru/wix?keyword=dannika+dark+seven+series+epub+download PDF link annotation
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/5f9a20677ced07.pdfIn PDF document text
    • http://republvinb.fun/magidebgozt.pdfIn PDF document text
    • http://avto-document.site/divinity_2_maladygylaj.pdfIn PDF document text
    • http://ru-order-687646765445.art/56771736775ljvo8.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/que_significa_estado_social_y_democratico_de_derecho.pdfIn PDF document text
    • http://bluetea.space/yaesu_ftdx-1200_reviewdy6a4.pdfIn PDF document text
    • http://clebohets.xyz/52322820617jne8v.pdfIn PDF document text
    • http://tdsevsvet.ru/saxidukuxc2dh.pdfIn PDF document text
    • https://mirinojasuri.weebly.com/uploads/1/3/4/5/134588432/nolowagoge_tiboxipuru_gerulawawarujid.pdfIn PDF document text
    • http://kutebirodomo.22web.org/talimoxu.pdfIn PDF document text
    • http://eliyalte.com/xolomoka6ctjf.pdfIn PDF document text
    • http://vclean-sale.shop/rodrick_rules_book_report78drg.pdfIn PDF document text
    • http://lorubuxetorifa.medianewsonline.com/remember_the_titans_movie_questions.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/lobojujugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujuramu.rf.gd/kaththi_tamil_movie_song_ringtone.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_e9c88b91e10c490bb355d9dd46b15312.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_3296dbd64655493fa8d7317f078333ea.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_450cfdbebc8147639e89816b54a7af66.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_2b66fe4c92144dbfbffca06b82768027.pdf?index=trueIn PDF document text
    • http://pujopomenuzejed.epizy.com/nabeworelugimibujuno.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_efa291dad0a543529aac61bdcc236ba0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 5308 bytes
SHA-256: 089affbcbe76f733c89377775c84b6e3e9a3d9a9921b935c8acae5e74231d77d
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 10960 bytes
SHA-256: 0c5f251a8c78ed640d26ac776faf9ccdc694c5f82a5a9fb6c20c544a917855f0
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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