Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d73b5ac80ff237c…

MALICIOUS

PDF

85.2 KB Created: 2021-03-16 20:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d210e97ace6c73bcae770868ad23a234 SHA-1: 0f9cb320d7ca99fae169c60746794965cd32bc0f SHA-256: 4d73b5ac80ff237cda28050b6aa1fc84d9c5d03e57bc0ae19220d27e8efe3b65
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary focus on redirecting users to potentially malicious websites disguised as academic or informational content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of disposable domains for hosting malicious content, likely to evade detection and analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://resalured.ru/award?keyword=chemistry+of+alkynes+pdf PDF link annotation
    • http://graatorama.space/what_is_the_meaning_of_magusdsx9x.pdfIn PDF document text
    • http://welilenasosuda.22web.org/clases_de_artropodos.pdfIn PDF document text
    • http://mp4.design/the_secret_dare_to_dream_music_scoremwud0.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/zuwurifolizaj-moladixobudarad.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/jowodimidizigugasuxa.pdfIn PDF document text
    • http://pravagims.net/super_mario_and_luigi_colouring_pagesz5eoi.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/nostalgia_electrics_cotton_candy_maker_extractor_head_replacementvmqhb.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/fisatekegejutux.pdfIn PDF document text
    • https://bewosugug.weebly.com/uploads/1/3/0/8/130814774/8887093.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/oppenheim_view_on_international_law.pdfIn PDF document text
    • https://motovatexasej.weebly.com/uploads/1/3/4/9/134900011/67097d5f98da.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/6cd4e2ce-c903-4523-b870-8476737139f6/cooks_essentials_electric_pressure_cooker_instruction_manual.pdfIn PDF document text
    • http://damewanobojojo.rf.gd/59817100902.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_f48297c9e196448ebde1c630a55abd22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f549bb-1c71-4c36-b6e4-7c969b5284bf/ver_los_juegos_del_hambre_sinsajo_-_parte_2_completa_en_espaol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bda42a8-0ae9-4a96-9b24-28a39fca5f58/xesadolofuk.pdfIn PDF document text
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_597dd27a987a4fdcb58c7ea542e623fd.pdf?index=trueIn PDF document text
    • http://jepevam.rf.gd/candy_crush_apk_mod_unlimited_lives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333c2e48-87a6-421c-a43f-5664f4ee0db0/wurizurajapuwi.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_06106d4dc8ec417bac86ef48163d4560.pdf?index=trueIn PDF document text
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_e0b775c11b3b44a59e42544a5f24b63d.pdf?index=trueIn PDF document text
    • http://kexomun.myartsonline.com/carl_jung_theory_of_personality_slideshare.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
    • 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_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 5352 bytes
SHA-256: 278f3eb135f185828b7c4b0b725c4c78409aacf1d9cc42e0be94d484001cf02a
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 11576 bytes
SHA-256: 2881637028f6cb397e57b79b093fd56f6168c4a156a725d9e1969847f6226237
font_02_sfnt_off00013280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 16132 bytes
SHA-256: 0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667